Donna is Kory AND Raven's best friend

Sources:

Donna, Raven and Kory: Titans #14 cover by Saowee

Donna and Kory 1: New Teen Titans #50

Donna and Kory 2: Darkstars #27 (1992)

Donna and Kory 3: Titans #22 (2008)

Donna and Raven 1: Titans: Beast World #5

Donna and Raven 2: Titans: Beast World #5

Donna and Raven 3: Titans #26 (2016)

People are always sleeping on Donna and Raven😞