[Daikaijuman54]

Interesting name, kind of reminds me of Battle Fever J and JakQ.

The Momotaro rumor, I can kind of see for a Sentai, since it's a boy (whom I'd assume to be the Red), a dog, a pheasant, and a monkey, if I remember right.

The Videogame rumor, while the name doesn't quite ring as much to me as a videogame theme, TheJaz has some good theories about the videogame angle and the "Don" part of the name, which I can definitely see.

Going by the name DonBrothers, it might mean that for the mains (I'd assume like a double reds situation or something to that effect), they're brothers like Uchuu Tetsujin Kyodain, or Ultraman R/B, with the other members being "different," whether they're non human, or just different suits aesthetically. At least, that's one way they could go, but I'm really curious and interested in what this team could be like.