お兄さん oni-san
お兄ちゃん oni-chan
兄 ani
弟 Otōto
弟 Otōto
"otouto"if it's your younger brother, "otoutosan" if it's somebody else's younger brother.
These phrases have no direct translations, and I'm having difficulty thinking of any Japanese phrase that conveys the same meaning.
Chocolate is 'chokoreeto' in Japanese.
Dog in Japanese is 'inu'.
This does not appear to be Japanese.
Domo.
Koibito.
Sakarerumono
Owari
Hajime mashite?