Onii 

onii an unknown Asian name that is some how in a few baby name books

onii

Onii by khfjshlj January 8, 2021

onii 

a hoe

''Oh my God, Onii is such a hoe''

onii by KarstenEkteMedium January 22, 2019

Onii 

An Unknown Asian name that somehow got into a few American baby name idea books next to issac

How did onii get into baby name books?

Onii by khfjshlj January 8, 2021

Onii 

Onii is The legend who Playes kingdom hearts he own a Keyblade which is magical

Onii is using power

Onii by Onii4cool November 10, 2021

Onii-Chan 

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.

My Onii-San is a cool bro
I really love my Onii-Chan!
Yes he is my Onii-Sama

Onii-Chan by Rywen March 10, 2015

Onii-Chan 

Onii-Chan means "Big brother" in Japanese. Most people assume it's a mating call of some sort because of hentai but no that's just hentai. Lots of hentai has incest.

"Onii-chan! Drive me to my friend's house!"

Onii-Chan by RigsSaysGoodbye May 4, 2018

Onii-san 

Onii-san is Japanese honorific, meaning 'Older Brother'. It is used within both families or close friends. The 'San' is used for a sign of respect by others within the family or outside of the family and the 'Onii' is to signify someone as a brother.

"Onii-san, come over here and eat with us."

Onii-san by Azeiox December 13, 2014