It's like -chan.
usually Imoto which mean little sister. or "name"-chan
-chan is a suffix that can be attached to the names of people to express a degree of endearment, or to social equals/inferiors. It is often, but not exclusively, used for women/girls.
Its a variation of chan.
Nii-chan means "older brother" in Japanese.
Oto-chan means little brother. =3 Suffix can be changed (oto-chan, oto-kun, oto-san, they all mean the same thing) or removed. Also said as ototo-chan or ototo or whatever floats your boat.
AnswerThe word for girlfriend in Japan is "Kanojo", this though is not a suffix, but you could use the suffix -chan to address to your girlfriend if you really adore her. It's really cute too.
Nii-chan or Nii- nii is Japanese for older brother. Onii-chan is someone else's older brother.
"Chan fuu" is not Japanese, but "Fuu-chan" could be an endearing way of addressing someone (likely a young female) whose name or nickname is "Fuu."
"Nii-chan" is a term in Japanese that means "older brother." It is a casual and affectionate way to address one's older brother or a male who is like an older brother figure.
'Little sister.'
"child" common in female names