The series theme is based on the legend of Momotarō---like Kamen Rider Den-O.
Red - DonMomotaro
Yellow - OniSister
Blue - SaruBrother (gorilla-like character(
Black - InuBrother (dog-like character)
Pink - KijiBrother (bird-like male character)
DonMomotarowill show up at the near-end of Zenkaiger and have tie-in to them. DonBrothers will technically be their sequel/spin-off. At first, I was surprised by the different-sized characters but I supposed it was done in order for COVID restrictions like Zenkaiger (having unmasked humans with heavy costumed humans). InuBrother (black) is clearly a puppet and KijiBrother (pink) is probably CGI-mixed with costumed character. Most US fans seem happy with the team.
Avataro Sentai Donbrothers is the 46th season of Super Sentai.