in Smash Bros Ultimate I main Incineroar and K. Rool! But I like to play a bunch of other characters on the side~
The only other FG I'd say I had a main in was Wrastor in like, early 2016-2017 era Rivals of Aether
Oh, and in Pokken I was trying to main Weaavile and Blaziken

In the other Smash games, I'd say I main Marth in Melee, what little I played of it in the past 10 years anyway, and in Smash 4 (mostly 3DS) I mained Lucina/Marth/Roy, but also tried a bunch of other characters like Lucas, Charizard, and Peach!