Who did you grail and why?

Jalter and Musashi.
Both with nice plot and high burst damage.

Altria and Gilgamesh. The best kings, most deserving of the grail.

Herc for gameplay. Kiyohime lancer and Ushi for love and head pats.

I would grailed all version of Jeanne (as much as I only have alter) and Musashi.

The one off I grailed Lv100 are Cu, I just have to follow the culture....lol

This might be a little bit too long.
I have grailed 5 servants so far.
Chloe (Max Grail to 100)
Bedivere (Sitting at 80, thinking of grailing him even more)
Mordred Saber (Single grail, lvl 92, I'll grail her more but she's not priority)
Mordred Rider (Lvl 90)
And Sanson (He's 85, gonna get him to 100 too)

For Chloe... if I were to say I'd have FBI knocking on my door.
I just like her like, a lot, she's cool as heck, and is an awesome servant overall too, but that's just a plus.

Bedivere, he just won my heart during Camelot. Pretty much he's one of the best characters in the whole game if not the best IMO, I love his dedication, his loyalty, his perseverance, his role in Grand Order, and I admire him too.

Mordred, she was my first SSR in the game, and my first Bond 10, and also the first servant to take max level her skills. When I got her I was like "Oh cool" (Pretty much GO was my introduction to the Fate Series) and after using her a little she was pretty cool, while I ascended her further I found her pretty cute, but also badass. She's currently not my priority to 100 just now cause, at 90 she does well enough, she's Bond 10 so I'd be "wasting" points and also I want to play other teamcomps.
Mordred Rider is just a consecuence too, but her NP spam is really fun, and she's actually one of the few AOE Arts Rider out there so yeah. Also during the event she was pretty good.

And last but not least, Sanson.
I like his character in game, his voice dialogues are pretty cool, specially the bond ones. I find him really interesting in the fact that he's all for peace, love, happiness, justice, while also being labeled as Lawful - Evil. I really like the ideals he shows (Justice, righteousness) and the concept of death overall is pretty cool, and the way he handles it as the executioner he is is quite cool too.
Also handsome boy too.
I've got to say that I also had some memes for Sanson too, but that's little honestly. I'll take him to 100 next. He's currently 85 9/10/9 and he actually works pretty fine for me.

I want to mention, too, other servants I'd grail would be David and Jekyll & Hyde mostly cause handsomeness and coolness they show. I love David's character overall from both the Bible and the game.
Jekyll & Hyde is fun, and he's pretty unique as a servant, you don't see him often either. Their character is pretty cool overall, two conflicting personalities that are the perfect opposite of each other. They were cool in London too.

I Grailed Cu and The Regend because they deserve that gold border, and both got cheated in FSN.

I grail all Nero's out of character loyalty, cuz Nero seems to like me enough for both versions to show up twice. I'm a fan. (besides, I also rerolled my account for Nero, so she was always worth it)

- Hercules, i Grailed him because his lore is epic and he's very strong. I read his tale when i was a child on the kids magazine, Disney Hercules 1997. It's truly an awesome tale !
One of the most memorable moment is when he is fighting multiple Elder Titan from Tartarus.

- Siegfried, i love to watch dragon slayer movies and Siegfried is really2 tough. He's invincible and sad thing is when he's backstabbed by his own bestfriend, such tragedy........
No man can defeat him in his life, he fight a dragon alone, fighting 1000 armies alone and emerging victorious for every battle.
On the Fate Apocrypha he gave his dragon heart to save the life of a young homunculus Sieg, yet another sad tales.
In a Holy Grail wars, when you have a Linden tree leaf, you can summon him as a Saber and the leaf is also the signature of his biggest weakness.

- OG Nero, she's my most dependable saber and for that she deserve the grail. I don't really like her actual lore and history, she becomes one of my favorite servants because she save my ass tons of times.
One of my favorite moments : Fate extra last encore, invictus spiritus 3 times Guts ( she died multiple times there ) + blocking and cleaving Excalibur Gallatine in half.
Also beating Gawain in the sunny day 2 times, one time when her master is the female MC and second time when her master is the male MC.

I Grail Seigfried and Hercules because they're one of my childhood favorite Heroes.
Nero because i love doing solos and like mentioned before she save my ass tons of times.

I grailed raikou for being my first SSR in a long time, next servant that i want to grail is kiara and is for how useful she was in CCC

I haven't grailed anyone yet because I haven't gotten those characters yet. When I do get them these are the characters I would want to grail in order:

1. Nero Bride: Nero is my favorite character and once I get her in April (I will whale if I have to) I plan to make her my first level 100.

2. &3. Sanzang Or Jack the Ripper: Again, I don't have them but I plan to save my grails after Nero Bride for them.

This would use up all the grails (and then some) that are available in NA currently but I hear that JP players have access to about 30 Grails so once we get that many:

4. Red Nero (I WILL get her by Nerofest): I would want to grail her to level 90.

5. Salter Saber: (another I don't have YET): Grail to level 90

6. Hans: I have him and will Grail to lvl 90 after the others...he deserves it.

7. Eurayle: I have her and will Grail to lvl 90 so as to be comparable statwise to her sisters.

You'll never guess.
On a serious note, Saber Alter for gameplay purposes purely, as most of my other grails went elsewhere (because love makes you stupid)

2 for Martha Rider, my beloved starting servant that could heal, survive, and crit for my sorry noob ass through fate accel zero.
Then saved up the next 7 for Martha Ruler just in time.
I'm planning on giving at least 1 for the others I like but special mention goes to Ozymandias. Not only did he spook me twice as my first ssr and just being so amazing, I also find his dialogue when asked about the grail hilarious. He accepts the sinful temptation challenge of the grail and is still standing strong at 90/92.

The first two Servants I grailed at the same time were Helena and Martha (Ruler).

I began to love Helena during E Pluribus Unum. Her character was really cool and her Design is... Cute and cool, yet sexy.
But she avoided me a really long time until the Fate/kaleid event. But by now I have her NP 5 and she is my most beloved Caster.

Martha on the other hand... Well, she's a Ruler. I just wanted a Ruler Class really bad and saw my chance during the Summer event.
During the event I grew fond of her personality. On one hand she's the Saint on the other she beats up her enemys merciless. And her voicelines are really sweet.
And last but not least her body looks great in that bikini. Her final Artwork is really beautiful. I just love her!

And for the third Servant I grailed: Kiyohime
She's my Yandere Queen. I love her story and how she despises lies.
I think she looks really graceful in her Kimono. Moreover, I instantly fell in love with her final character skin. The black-gold Kimono and her white hair. For me, it's the best change out of all Servants.
That's why I grailed her to Level 90.
But that's not all: She's my main farming Servant and the first one I got to Bond 10.
Maybe I will grail her to level 100.
I also have her Lancer form, which I love just as much. Her final form looks great as well with her black bath gown and the cute bikini.

Aaaaaand... Again a really long post.
Sorry, I just can't stop to babble about my waifus. 😅

I will grail every Jeanne version to level 100, that includes the 2 welfares too. That makes it 29 grails used, there are currently 36 on JP so the extra ones will go for Abigail.

Leonidas for being a badass. Grailed him before even getting to babylon where I saw him being even more awesome.

Robin to 90, as he was the only decent dmg dealer in my early game (stheno was my starting sr). Even to this day he still deals tremendous dmg, a bro through n through worthy of my grails.

Ibaraki to 90, the only decent sr i had in my early game which to this day is still my main dps. Realizing how much i relied on her made me go ahead and grail her so you could say that its sort of for gameplay.

Astolfo to 90, how can it be gay if he looks so feminine?

Kiyolancer to 90, "DID YOU HEAR THAT?, MASTER SAID HES GOING TO EAT ME" and on that day i unlocked a new fetish. Summer event was great cant wait for that rerun.

Currently contemplating if i should grail someone to 100 or just lvl various ppl to 90

personally, i did "grail for love" thing and grailed jalter, seiba+alter, and lartoria. it's all up to you either love or gameplay, but for me i save it for my love

Herc was the first servant I grailed to 90. He pulled me through a lot of the harder content in the game. He now enjoys retirement at NP3 after busting open countless demon god pillars.

I grailed Summer Martha afterward so I can have a representative for the extra classes before I was graced by Jalter, she's awesome as well. Used to pull off solos using her to break up the monotomy of farming.

Other recipients of grails to 90 were Kuro, Kintoki Rider and Saberlot. They serve as my boss killers.

Lastly, gave 5 grails to Bone Daddy when I got him last month. I know he's not the best gameplay wise, but I've always yearned to get him in my Chaldea ever since. He also reminds me of Skull Knight from Berserk, so that's an even bigger plus. Almost have him at 10 10 10, just need some more chains and stingers. Events cannot come sooner enough!

I max grailed Jalter due to having one of the best Attack increases per grail and for being one of my 2 favorite characters in the game, My current 5 remaining grails are reserved for Okita-Alter in the future (the other favorite character). As for any other grails that I may get, I haven't decided at this point, probably will save them until we can finally grail Mash.

Grailed Herc for gameplay reasons, as he's soon reaching the max bond limit and already hitting like a beast
Also saving my other grails for Quetz on NA because of waifu reasons !

I have just grailed Musashi... I am currently saving the rest of my grains for Ereshkigal if I manage to get her...

Other servants I want to grail one day if I manage to actually get them include Jalter, Quetzalcoatl and Raikou.

Reason for wanting to grail them all is because they are both waifus and top tier servants so I would get the best of both worlds.

I grailed Musashi and Cat.
Musashi - Lv. 100 - Something inside me compelled me to do it. Her personality is lovable and she just loves food. Not my personal waifu, but still one of those likable servants.
Cat - Lv. 90 - The 4* I got from tutorial summon. Best maid and chef. Will ask her to cook food for me every day.

Imagine being in a cozy room with both (+ Mashu cuz she's "clingy") at the same time, enjoying food, games, and stuff. Pure bliss.

Grailed Herc... because it's a just reward for his stalwart Loyalty and long term service that managed to get me through the Singularities without letting me down even once.
but i'm hoarding grails for Waifu Musashi and i hope Jalter when she visits my chaldea/shadow border.

Kojirou because as a newbie I didn't have a strong assassin with a np that did damage, and I like kojirou way more than jin ke.

FSN cu because I love his survivability (and character from the show) and it took me a YEAR to summon a gold st lancer, so I grailed him to boost his stats.

Herc, nuff said

Saberlot because I love his crit storm playstyle, but he has no self defense so I wanted to boost his hp.

I grailed Cu alter becouse, well he is Cu, and is alter, cant argue with thet.
I am about to grail Chloe, she served me well and i have alredy brought her to 10/10/10. awsome servant and my third 4star.
i basically used her since septem.
And i will grail Taiga.
She is the Coolest thing ever putted in any game .
I will grail her to 90, but i am in qp hell right now, so have to wait till this 1/2 cost of daily is over o.o
Grail for love AND gameplay. I would not grail medusa despite she is my waifu, becouse she do what she is supposed to do alredy,
Beside, my only waifu are medusa and atalanta, and the second is not coming home....

Kid Gilgamesh to lvl 80
Im a gil fan and I like his desing and the Gate of Babylon NP, aside from the charm skill the other two are pretty good.

Alexander to lvl 80
He was one of my firs servants and help me a lot with farming, also like the final art of his card and the fact he uses buchepalus in the NP. His last skill is also very useful for party quick up. Im very impress with his NP damage at lvl 80 and NP5.

Lancelot Saber to lvl 90
He is a great unit gameplay wise and thats pretty much the only reason i grailed him, i also like the final art with arturia in the back, but his ability to crit really surprise me, plus he spook me when i was rolling for three servants i really wanted and now he is NP3 so well worth it.

Chloe to lvl 90
Same as for Saberlot she is a very powerful unit for gameplay whith good skills, dont like it that much but dont hate her either.

Martha Ruler to lvl 90
Im a fan of Martha i like her character and personality plus i wanted a ruler and better shes an offensive ruler so this one was for love and utility.

Helena to lvl 90
I love Helena, i think shes pretty cool and i like her story and how she came in contact with the mahatmas and possibly a glare to the root. Her battle animations and NP so cool. Shes only NP1 and I have Nursery at NP3, so nursery was the better option but Helena deserves more love.

Im conflicted to use grails with my SSRs because of the number of grails i have to use to lvl 100, i probably grail Jaguar for waifu and gameplay

Currently only have my NP2 Shishou grailed to 100 (for even more boss killing and cause she's a pure badass waifu, totally worth it). Future plans include my NP5 OG Artoria (as soon as I've got some spare EXP cards) and my NP4 Jalter (as soon as I get her to NP5). Other candidates in the future are Summer Artoria (both normal and alter), MHX Alter, Musashi or Okitan, though I'm not sure yet, who to grail out of them (guess only the future will tell?) For now my next targets are, as I said OG Artoria (because she's NP5, has been my first 5 star, is top tier waifu and deserves some love. Also, she's really good for farming after her strengthening) and Jalter (because she hits like a truck and is best Avenger waifu).

Emiya and Ushiwakamaru because i like them.
Andersen because he is a main member of my team.
Boudica and Mata Hari because i love them.

I didn't grail Mordred, Sanzang or Quetzalcoatl because if i would have to spend 5 grails to put them in a round number

I plan to grail Ereshkigal(god willing I summon her)to 100

Shiki assassin to 90... Because I love everything about her game play and waifu reasons.
I will grail Salter (90) if she comes home and Arcureid (100) if she appear in FGO.

I haven't grailed any sr or ssr servants yet, since I think they're powerful enough; but planning on grailing Hercules.
I've grailed Hans 3x; planning to get him up to lvl90.
Also Cursed Hassan; he's just really my favorite. I like his chara design (he looks really cool with the cursed arm), plus his role at Camelot is very likable too. I also like the 'crunching sound' his NP Zabaniya makes.