I don't know if someone came up with this before. I know there's a fanfic by Dartz-IRL that may or may not cover the subject, but I prefer to post my comparison before reading it. Anyway, both series' casts match in quite an amazing way. I've tried to order the correspondences from obvious to utterly crazy, though in my mind
they all make complete sense:
Gendo............Adama
Fuyutsuki........Tigh
Shinji..............Apollo
Asuka.............Starbuck
Rei...................Boomer
Toji..................Helo
Aoba/Hyuga.....Dualla
Ritsuko.............Baltar
Maya................Gaeta
Kaworu............Number Six (!!!!!!)
The orphaned roles would be Misato, Kaji, Hikari, Kensuke and one of the male BBs on the NGE side; Tyrol, Anders, Cally and Zarek (and most of the humanoid Cylons) on BSG's.
Ok, that's all for now. I hope it's the right category for this post.
Discuss and enjoy!