By A Mystery Man Writer
Sage (セージ Sēji?) is a character that appears in the Sonic Pokémon Series. She is a mysterious girl created by Doctor Eggman that appears across the Starfall Islands, cautioning Sonic the Hedgehog to leave the islands despite his mission to find and save his friends. After the events of Sonic Frontiers, she is a constant AI helping Eggman in cost of taking over planet Mobius and maybe beyond that. Sage has been described by Silver to be one of the many mysterious elements of the Starfall Islands.
Sage (Trainer class) - Bulbapedia, the community-driven Pokémon encyclopedia
Sage, Sonic Pokémon Wiki
Sage, Sonic Pokémon Wiki
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Megumi Hayashibara - IMDb
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Sage (Sonic) by Dawstheartist on DeviantArt