The main team, "The Sisters Robotnik" team, are characters who are all died within their own canons but are alive again (Sage canonically got revived by Eggman via the ending of Frontiers, while Maria, Cosmo and Hope are revived for the AU. The 4 main members being Maria, Sage, Hope and Cosmo.
Those who help out but doesn't fit the team structure of being dead but revived includes Tikal The Echidna(who died but is still a ghost) and Tekno the Canary(while Sonic The Comic ended, she never really died. Technically she even cameoed in the Archie comics both appearance and in name if you count that.)
Maria, Sage and Tikal are based in the in-game canon (IE the games and IDW comics)
While Hope, Cosmo and Tekno are from varied "canons" (Archie, Sonic X and Sonic The Comic) due to being pulled in from the affects of the Phantom Ruby.
With Tikal and Tekno added, here's how "The Sisters Robotnik" Team works now, in both status terms and canon terms!
#SonicTheHedgehog #FanArt #SonicArt #SonicAU #MariaRobotnik #SageRobotnik #SageTheAI #HopeKintobor #CosmoTheSeedrian #CosmoSonicX #TikalTheEchidna #TeknoTheCanary #TheSistersRobotnik
