Board Thread:Episode Discussions/@comment-3261234-20150416133517/@comment-2140588-20150416172053

Seelentau wrote: 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. Coming from Yugioh, I can easily disagree as Sho uses the honorific to adress Judai, and the subs translate it as "big brother". Of course, the subs are most likely wrong, but I wouldn't necessarily say that it has to be in a gang.

Seelentau wrote: 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? No, but saying that they are related would also be speculation.