Divine Knockout, Nickelodeon All Star Brawl, Super Brawl 4, Shovel Knight Showdown, Multiverse, Super Smash Bros or one of my favorites Them's Fighting Herds which has a brawler feel but is really a fighter game. There is also Kung Fu Panda Showdown of Legends but is a bit older and if I am not mistaken closed their servers on console at least. There might be rented or community servers on pc.
