[にい, nii](n, n-suf) (1) (See 兄・あに) elder brother; (pn, adj-no) (2) (fam) (male) pronoun or suffix used in reference to an older brother figure; Mister; Mr#1902[Add to Longdo]
[にい, nii](n-suf) (1) (fam) used after the name of someone who is an older brother figure; (n) (2) (See お兄さん) used with various honorifics to mean (older) brother#1902[Add to Longdo]
[にいさん(P);あにさん, niisan (P); anisan](n) (1) (hon) (See お兄さん) older brother; elder brother; (2) brother (as older-brother figure in friendly and or work relationship); (3) (vocative) young man; buddy; fella; laddie; (P)#19584[Add to Longdo]