Keisuke Sannan from Hakuōki: Shinsengumi Kitan
Keisuke Yamanami from PeaceMaker Kurogane
Both are actually based on the same historical person and it seems like, so far, that every interpretation I've seen of this shinsengumi member is sporting glasses.
*~Cosplays in progress~*
Sanosuke Harada - Hakuōki: Shinsengumi Kitan
Kojirō Sasaki - Iza, Shutsujin! Koi Ikusa
Kenshin Himura - Rurōni Kenshin