Upcoming quick servants

For this year you've got, in chronological order:

MHX Alter
Okita
Kintoki Rider (In case you didn't get him)

And then afterwards, its eternal suffering until Skadi.

Quick welfare event servants is pretty dominating this year.

Welfare Ishtar Rider, basically a 4 Star Achilles. One of the best Quick AOE rider and she is a tough sustained DPS that can hit like a truck.
Welfare Santa Altera Lily, Quick ST Archer. A great Archer substitute for anyone who don't have Chloe.
Welfare Kintoki Rider, gamebreaking Quick ST Rider. Basically a Quick meme.

Their main point is, they're still good without Skadi. Skadi just make strong servants like them into more broken unit.

All mentioned event servants is more than good and they're strong. For Casual F2P players it's not really friendly but considering how good they're, you don't want to miss them.

Bonus : Assassin Scathach also have a re-run this year, compared to other Quick welfare servants, she's not hitting as hard as them but she's farmable and we can upgrade her NP lvl to 5.
Good unit to have for anyone who don't have any AOE assassin such as Cleopatra and Shuten Douji.

The most notable ones are probably MHX Alter, Metlilith, Summer Rider Alter, and Kintoki Rider.

Seems that no one mention Edmond Dantes, the next banner? He is the one benefiting greatest fr Skadi, from human tier to Godlike tier when Skadi comes out. In Jp, Double Skadi + Dantes = game over...

Since no one mention him, I would say Dantes if you're looking for Quick oriented SSR servant. He's really powerful (even considered a meta) in JP server after receiving his Interlude and when Skadi is released, he is one of the best Quick servant for both farming and challenge quests.

NP2 Dantes and double Skadi are all you need for gameplay meta in this game.

Personally, the two best ones right now are basically back to back: Dantes and Okita. That is where what little savings I have left is going towards until summer.