I would play Splatlings for every class. I would just replace all the weapons with Splatlings. The "Splat" in "Splatoon" is short for Splatlings :)
But in all seriousess, this was fun to think about. I love thinking.
Shooters: Squeezer. Hurts my hands, but it's very fun
Rollers: Dynamo Roller. Big chunky :)
Chargers: Z+F. I really like having Splash Wall on it. Lets you go more aggro.
Sloshers: Explosher. Honestly not sure which kit I like more, but I'm putting vanilla here simply because I've played it more. I love Explosher <3
Splatlings: Hydra Splatling, my love, my beloved <3 I would replace all the weapons in the world with just you if I could. Also the reason for vanilla and not Custom, despite it having the more synergistic kit, is because I play in a no-Screen team </3 That and I do have a soft spot for the Autobombs.
Blasters: Range Blaster. I'll be real, I don't really play blasters at all. I'm just putting vanilla Range here because I liked it in the Blasters-only challenge.
Brushes: Octobrush, my dear. My first love. Your kit is perfect and you're radiant <3
Dualies: Dapple Dualies. I love being a rat. And I love beakons. This is by far my weakest class tho, so rip.
Brellas: Sorella Tenta Brella. I love me a good ol' heavyweight. Big meaty sound effects, the power behind the one-shot, the massive shield. Now that's a big boy weapon after my heart. Not really feeling the InkVac on the vanilla kit, so Sorella it is.
Stringers: Inkline Tri-Stringer. This was a tough choice between the kits, they're both very fun. Giving Inkline the slightest of edges just because the kit cover's the main's weakness of relatively low paint output.
Splatanas: Splatana Stamper Nouveau. I don't think I've touched any Splatana in this game at all, besides Wiper when the game first released. Literally no clue which one I'd actually enjoy. Picking Stamper Nouveau purely because the kit is interesting and I've been meaning to try it out for ages now. But I'm actually too insane about Splatlings to do that, rip.
Ha, kinda looks like these got more wordy as I went along :D