1040 BCE - Raven is born.
1024 BCE - 16-year-old Raven becomes a tribal shaman.
1016 BCE - 24-year-old Raven discovers the Stony Path of the Manitou.
1007 BCE - 33-year-old Raven marries Dawn.
1001 BCE - 39-year-old Raven slows his and Dawn's aging.
1000 BCE - 40-year-old Raven gives up his role as Manitou Shaman to his successor.
998 BCE - 42-year-old Raven answers the call of the Stony Path & moves forward in time.
7 years ago - 42-year-old Raven returns from the Stony Path & takes up the mantle of Manitou Shaman again.
4 years ago - 45-year-old Raven joins the Global Guardians as a representative of America's native people, specifically to separate them from Warmaker One.
1 year ago - 48-year-old Raven is contacted by Tye Longshadow, and helps him gain control of his powers by connecting him to the spirit of John Standing-Bear through a fragment of the Manitou Stone.
Challenge of the Super Friends was an extremely high profile cartoon at the time it aired, and in many ways has defined the was many of the characters on it are remembered to the general public. Whether this means the Hall of Justice or Lex Luthor's battle armor, it's influence is incredibly long reaching. One of the most popular ideas to come from that show was Apache Chief, who appeared in almost all 16 episodes. He was a pretty simple character, but a fun one. He like several other characters invented for the series, was owned by Hanna-Barbera rather than DC and so existed solely as a part of that series and never in the DC universe proper.
Manitou Raven was created by Joe Kelly and was clearly a specific reference to Apache Chief; he yells "Inukchuk!" and can change his size, among all of his other abilities. He's clearly a far more elaborate creation than the original Hanna-Barbera character, who was later re-imagined on both Justice League Unlimited and Young Justice: Invasion as Longshadow.
Meanwhile, Manitou Raven appeared in Justice League Elite, a team we're using elsewhere. We chose to place him in the Global Guardians specifically because the team is traditionally led by a magic-weilder, Doctor Mist, a character we're deliberately ignoring because he's boring. Raven, meanwhile, is intensely visually engaging, creates a wealth of history within the DC timeline, and immediately creates a level of intrigue within the team by being a representative of Native Americans rather than the government of the United States. As long as he is written with the understanding the people he represents are a very real and active community that exists today, he can be a fantastic character.