Curiosity getting to me!

Probably Cu Chulainn since he is one of my favorite servants and the extra HP makes him even harder to kill.
He's actually the only 3* servant I spent grails on, but I stopped at lvl 80 since I'm never using him anyway.

I already max grail & bond 10 my boi St George to lv 100. He's the best low-cost tank and a berserker's BFF

My next max grail will either be Paul Bunyan or Eric Bloodaxe.

I'm thinking of using some on Bedivere just to get a gold border on him, though this is absolutely for personal taste not for gameplay.

Another one would be Salieri but he's still far.

a lot of people on my friends listen have maxed grailed 3* servants. ushi and kiyohime seem to be the most popular. i'm assuming for head pat reasons.

i'd max grail medusa. she's my favorite natural rider (not counting the baber alters santa and soon-to-be-maid), she has a rockin body, and that final artwork is amazing. i'm also a big fan of her mythological background.

Kojirou. I like him in UBW, and I like his animation, and it is a crying shame that someone who could face off with saber was made a 1*. Hard to justify the use of multiple grails when you have shiki and jack though.

Why not grail the 0 star Angry Mango

I'm actually Max Grailing Sanson, he's currently at 85.
I also aim for Bedivere lvl 100, though he's currently sitting at 80.

I don't know if I have a proper reason other than I just like the characters in-game, though that goes more for Sanson. I really like his voice and his dialogues, and his design is pretty cool, specially his saint graph.
And Bedivere is just the best knight. He's MVP of all NPCs from the singularities for me. I loved him in Camelot, he just deserves it.

As for others servants I'd grail, Billy, David, Jekyll, Okada Izou, Salieri.
Reason as to why I didn't grail those archers is pretty much that I have Chloe at lvl 100 and pulled Ishtar last Christmas.

Well I’ve already got Medea grailed to lvl 90 with her skills at 10/10/10 so probably next time embers are half AP or we have a success rate up I’ll probably take her up to 100.

Caster Gilles.

Because he is the greatest cool ever. (O )____( O)

Euryale, David and Robin carried me around Camelot, and are very useful.

Kiyohime and Ko-Gil, I just like them a lot.

I choose to Lvl up Medea to 100 and raise skills to 10/10/10 (currently lv 90 and 10/8/8).
She deserve this and more arts / side story

I haven't seen many people considering to grail him, but I'm currently grailing my Billy (though I might stop at level 90 for a while. 5 grails to level 100... Unless future events are generous enough to give them, Billy will have to wait a bit ): ). Not only was he one of my very first 3* on my tutorial summon, meaning I hold him extremely dearly in my heart, but he's currently my best Archer and one that has saved me in lots of occasions (sometimes even being the last man standing, his crits killing the enemy before it could kill him). I can barely imagine what damage 120% critical strength would do when he's lvl 100.
Sure there are tons of better Archers in game, I'm fully aware of that. But max-grailing the tiny guy who carried me through several stages since the beginning would be incredibly satisfactory. He deserves every grail I give him.

Honestly Jaguar man, because I'm a fan of Taiga.

Bedivere.

Honorable mentions go to: Euryal, Jaguar Man, Robin Hood, Arash.

None. I'll stop at 80 or 90 depending on the servants. (same goes to SRs capped at 90, and SSRs stay at 90)

Made an account after lurking on these guides for a while just to answer this, and the answer is that I’ve only grailed one servant so far and that’d be my Level 100 Arash ;w;

Did it for the projected NP damage memes first, but then realized he’s got a good voice, character, and Stella memes were actually 100% not exaggerated and amazing for farming and non-boss story quests (and bosses, too, tbh). Also, I think this was after reaching Lvl 100, but his part in Camelot wrecked me. Best boi Stellaman deserves it!