Board Thread:Episode Discussions/@comment-3261234-20150416133517/@comment-3279282-20150416171333

Aniki isn't similar to onii-san at all. Aniki is usually used for the head of a gang, for example. See Franky in One Piece.

And I never said that the words can't be used for not related persons. It's just not usually the case. Furthemore, in our case, we don't know the age difference between the two, do we?