Spoiler Alert:
Stamper: Fizzy + Crab = Good versatility and movement. Neo Stamp with Mobility is a strong option, as Toxic Mist is the most complained about part of Neo Stamp. Toxic Mist DOES work and I've seen creative ways to make it work (some which I now use) but something else is preferred (as a main).
Splattershot: Splat Bomb + Zooka = omg. Suction Bomb is great for displacement but I often want a bomb that can blow up quicker, thus kill quicker. This is my ideal vShot kit. Zooka is zooka (my favorite special that's hated lol), enough said.
Dualie: Curling Bomb + Reefslider = Assuming it's a 1 roll like the base kit, that brings it down A LOT. Curling bomb is great for mobility or to psych out opponents. Reefslider though...Dualies don't need more Reefslider...It's Enperry but worse.
Splatling: Wall + Booyah Bomb = I think it can work, on paper. However, I see this loadout as extremely gear dependent, making serious investment in Ink Saver Sub essential!
Charger: Mine + Tristrike = A hybrid of Z + F and vCharger? I find Vac on vCharger to be a bit weird tbh. Tristrike I think is a better special, especially to cheese Zones. Overall a better kit.
Brella: Sprinker + Storm = I haven't used Brella since 3 starring Sorella since its debut. I do know about ink efficiency buffs to Brella but I think Fizzy would work better for what Sprinker is trying to achieve, plus have a bit more consistency. Storm is a good special so there's that.
Brush: Mine + Stamp = Mine I don't think fits a Brush style. Stamp isn't a viable special unless it gets a frontal buff. It's definitely a break down the door/come crashing kit but with a lot of risks.
Stringer: Toxic Mist + Wail = It's the exact same thing as the vanilla Tri-Stringer.
Roller: Burst Bomb + Kraken = Burst Bomb is a win on anything. Cheap sub that has versatility (think Carbon Deco). Kraken I think can work. I would like to see this be a kit myself actually.
Blaster: Curling + Wave Breaker = It is slower than normal Luna so there's that. Curling I think can be great for mobility/escaping but maybe something else is better. Wave Breaker can combo so I think that's a good special.
Slosher: Suction + TriStrike = I think with what they're going for with Slosher, Suction Bomb may or may not work. Both Suction and Splat Bomb can combo with Slosher, so it's a preference. TriStrike is on vSlosh so there's that. Personally I think the vSlosh kit is an ideal kit.
Octo Shot: Splat Bomb + Splashdown = I'm surprised this isn't a thing yet. Assuming Octo Shot's weapon stat is the same as TTek/vShot, Splat Bomb is an ideal sub. Splashdown I think can work but on higher level it won't be as effective.