OOC: IMPORTANT Permission post!
Beyond Birthday has a wonderful (?) ability.
He has the eyes of a shinigami that allow him to see name and lifespand of every human whose face he sees.
Since I won't always know the canon of your characters please post here, if:
1.)Your character looks human, but is not.
2.)There's anything strange with their lifespan.
3.)They use a false name.
4.)You have a problem with this ability and do not want B to see those things.
He will not tell anyone about the ability and he will not speak about the lifespans if there isn't an according plot.