My dream rep would be Lilimon (my fav Digimon) but no way is that even happening so yes Agumon.
My idea would be an evolution gimmick based on the original Virtual Pet. Basically Agumon has a meter that fills up every time they get hit or strike a successful attack, similar to a super meter in SF that when fully charged can allow you evolve them into Tyrannomon (if you focused on melee and basic attacks) or Greymon (if you focused on Specials); Agumon's original exclusive evolutions (which also have similar bodytypes, allowing easier asset reuse with rigging etc) that also acknowledges of Digimon does evos in a neat way. The Final Smash then is Metal Greymon.
I'd also have it that if you attempt to evolve before the meter is filled you evolve into Numemon but that would be a lot of work for something likely not that fun to play as.
See, Agumon is in this weird grey area of where the Anime far outclasses the virtual pet origins in terms of recognizability. I feel most would just see him as a Anime character and be like "ADD EVERY STRAWHAT, SAKURAI YOU COWARD." And I just dont think Sakurai wants to open Pandoras Box as it were.