Furnace Sonic is a female metal counterpart of Sonic the Hedgehog, created by Starved Eggman to catch and cook Mobians with her Furnace chest, although in this version, she is just Starved's cook after Sonic was caught and cooked, she tries to make Starved eat healthy, this doesn't go well though...
Even if she's a robot, she's polite and nice to everyone, very servicial as well, will follow her master Starved Eggman loyally.
She has huge thighs, don't ask why.