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TLDR: Older Brother A little more detail if you like- Onii can end with 3 different Japanese honourifics, -San, -Chan, or -Sama. -San is the basic ending for the basic big bro. -Chan is a more compassionate ending for Onii if you really love your big brother and feel emotionally attached to him greatly -Sama is a bit of a formal ending for big brother, nothing too special.
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