Some of us here know quite a bit about these groups and their history, from family roots in the region and interacting in person. The Mardi Gras "Indian" Crewes have developed their own subcultures. Like many Societés, this community is valuable to them. Some of the costumes they design are intricate works of art. Unfortunately, many also depict problematic caricatures of Plains Natives, and other disconnected stereotypes, that have nothing to do with the Indigenous people of the region.
Thanks to these Crewes, we now have mainstream performers, including white men like Harry Connick Jr, performing songs of theirs like
"(Big Chief Like Plenty of) Fire Water". They also think they're "being respectful" and "honoring".
While the history of Black Indians is real and at times painful, it's not as mysterious as some think. There are ways of reconnecting for those who are actual descendants. Like any descendants, it's about being good relatives. Black Natives are almost always a very different group than these performers at Mardi Gras.