ok so i fluctuate between a lot of weapons, however there are three weapons that i can consider my main: splatana wiper, ballpoint splatling, and painbrush.
i started playing wiper when i first got splatoon 3 and i was having fun, and even more fun after it got it's paint buff. torpedo is pretty nice, helps you locate enemies and also even combo hits -- then you got ultra stamp, it can be a really fun special to use but it can also be really easily countered by a A LOT of things, so you gotta use it at the best opportunity so you just don't go in and die when trying to use it.
and then you got the deco kit... i don't really like it in all honesty, beakons are cool but you have to fully rely on your main weapon to fight (which can be difficult) and then you've got tenta missiles for the special... so okay, it can help with pushes but it doesn't really help in a middle of a fight, i get that it's meant to fill a different role than the regular kit but it isn't really my cup of tea.
and then you've got ballpoint! i started playing it on the last month of chill season and it was super fun, then the ink jet buff happened and it became even more fun! fizzy bomb is a nice sub for it since you can use it to help you get your special or get a cheeky kill (like spamming it on the stack in barnacle & dime from your spawn or throwing one in mid when the enemy team is entering the area) and then you have ink jet!!! it can help you retake an area or help you get out of a sticky situation where an enemy is trying to rush you down.
but then you got the nouveau kit, they kind of fumbled the bag when trying to give it a more supportive kit. ink mines are nice, i like them since they give you a heads up if somebody is trying to flank you and you can also place them down on the objective (like the tower or splat zone), but then there's ink vac... eh, i feel like they could've given it a better special. ink vac only really helps with pushes which is good, but it doesn't really help you defend yourself and ink vac can be easily shut down, i might be using the special wrong but in the times that i've used it, it didn't really help me. the only mode that i've found the kit fun to use is tri-color!...but only if you're on the attacking team.
and finally, painbrush! i began playing it in sizzle season, at first i didn't think i would like it because i usually didn't like slow weapons, but once i picked it up, i had a lot of fun with! curling bomb is pretty decent, good for helping you get in but i usually have trouble finding other uses for it, and you've got wavebreaker!!! it's really good, you can use it to locate opponents plus push with it! and also in some situations use it as a meat shield!
and then you got it's nouveau kit, which is really good!!! point sensor basically acts as a mini wavebreaker for it, helping locate opponents but not really damaging it. i didn't think that i would like tenta missiles on it but yet again i was surprised! painbrush can get tenta missiles quickly, and it helps A LOT with pushes or taking back an area. i'm using it a lot more than the vanilla kit because of how fun it is!