Gameplay wise, I'm reminded of games like the recent Dragon Ball Xenoverse and the Dragon Ball Tenkaichi series - very simplistic three-button fighting with light, heavy and special attacks that can be chained together by pressing the buttons in different orders, with specials generally being used to finish off a combo. As such, the general gameplay doesn't change too much between characters with the exception of which button combination does what; but it's a nice casual experience by fighting game standards - the kind of thing you play to wind down or because you just don't care for a more technical fighting game. The average match is three-on-three, with two main fighters and an extra "support" character on each team... this is worth noting because a good quarter of the roster (generally the characters who wouldn't "work" well as playable characters) are only available as support characters.
Away from how the game plays, the level of attention to detail is -superb-. Every character has their own unique animations, taunts and start, win and loss quips - and they've even got unique quips for specific match ups; some of which would make sense to even casual fans, but they -can- get ridiculously meta; with characters from different works by the same author (Koro-Sensei and Neuro) having their own unique exchanges based upon whether they're fighting alongside or against each other.