[giftart] For Becky: Mr. Kid-No-Pants

Evil Twin and I are currently in a minor debate over what Shin'ichi/Conan's blood type is.
The Japanese sites I check either say 'A' or 'Unknown', the English sites she checks says 'B'.
So... anyone have proof which one it is?

For btailweaver: Mr. Kid-No-Pants
Because of this conversation.