|Stance||Orthodox Boxing Stance|
|Wins by KO||19|
|Championships||OPBF Lightweight Champion|
|Manga Debut||Round 853|
|Anime Debut||Does not appear|
As a minor character among others, Domingo's past is never elaborated on in the series. It is known that at some point of his boxing career he attained and held the OPBF Lightweight title, but subsequently loses in a title defense bout against Mashiba Ryou in the tenth round by KO.
|25||LOSS||21-3-1||Mashiba Ryou||KO||10(12), 0:44||1997-4-27||Tokyo, Japan||Mashiba's Return From Suspension Match, Lost OPBF Lightweight Title|
His style is said to be similar to Makunouchi Ippo's. Domingo is an in fighter of great skill, and is said to have been a very powerful puncher and tough contender. Being able to take an exceptional fighter like Mashiba into the tenth round, it can also be assumed that Domingo has a great amount of stamina and/or spirit. Having been the OPBF Lightweight Champion for some time in his career, it can be assumed that Domingo would at least know the very basics of boxing.
- His name was mistaken as "Aaron Domirego" in fan-translations which they were translating from magazine releases of the chapters back in 2010, and therefore they didn't have alot of information on the names, the information from those changed into the final releases of the volume which had better information on the name and matches.