i have more suggestions to this topic.
1.(as stated in the comments) an ability to strike the eye of someone even if they have their helmet on cause the intro is awesome but having it in the game would be even better
2.a time+travel system, just to add a little “story” to the game maybe if you want to do a fight or go to the shop in a coliseum then maybe you should actually travel to it that way bandits can attack you and drop items and money or a rare chance to find a beat up person and you can decide if you want to add him to your team (bandits would get stronger depending on which city you travel to/from)
3.chat when fighting multiplayer
4.maybe short animations after defeating the last team in a coliseum? like: the cezar or whoever it is looks at the cheering crowd announcing the new champion or something nice and short like that (if you repeat the fight you don’t get the animation)
that’s that also people saying the ability to change names, hair colour ect. well… that isn’t realistic maybe give them a nickname but to custumize them as-if the were a player then no, i don’t like the idea games like this should be as close to truth as possible