Not much is known about this group, other than they are compassionate beings and wish to share harmony and compassion to everyone.
The comic book version of the Indigo tribe is more “extreme! in their mission to spread compassion, but my non comic line-up is more gentle, understanding, and arguably embodies the message of the group better than the comic book version.
Here is my non comic indigo tribe line-up
From Top to Bottom: Steven universe, Fluttershy, Tigatron, Mob, Koyomi Araragi and Felicia.