I thought Tobey Maguire WAS Topher Grace
Side by side you can almost tell them apart. Almost.

Gwen Stacey
I'm not a comic book reader anymore, so I don't know what her character is supposed to be, but after a short opening scene where she answers a difficult question in phyics class, the writers have performed a lobotomy, and transplanted whatever mass was in her head into her bra.