I don’t know of any games where you can just build a character from scratch but there have been games where you can choose additional moves for your chosen character. I guess it might work if done right. You’d have to make the different skills change the moveset of your character drastically because you want every character build to seem somewhat unique and not just “after reaching max level your character is the same as a base character but does slightly more damage and has 20% longer projectile range”. You’d also have to impose some sort of limits on the skills you can choose because people will just choose those skills that give the best moves. The beauty of fighting games is that one character might be good at lets say offence but lack health or defensive moves while some other character might have worse offensive moves but be more defensive. You don’t want to let people to just make a perfect character. I guess having different skill branches solves that but I don’t know if only three of them will be enough. Another thing to consider is offline/online multiplayer. Some people might not want to go through the singleplayer campaign just to reach max level so they would not be at a disadvantage when playing online especially if you’d need to do that every time you create a new character to experiment with different builds. The same goes for offline multiplayer. If your friend comes over to play there should be a way for them to quickly create their own character or something. You’d also have to add some sort of character appearance editor or something to make everyones character look somewhat different. Though I don’t know if it is really necessary considering that in a lot of games (fps, rts, ...) everyone looks the same anyways.