Oniichan

Biography
"Oniichan" lives in Town with his parents and his obsessive younger sister. He's also cousins with Senpai and the Detective. At school he likes to spend time with his girlfriend. He's a member of the baseball team but sometimes uses the time after school to meet with his girlfriend. Just like Senpai he likes to read especially fantasy books.

Personality
Oniichan is generally well mannered but becomes irritated when people mishandled his stuff. He isn't above lying to his sister if it means she doesn't freak out. Also he easily becomes angry whenever there's an argument with his parents, notably his father.

014 Cosy Evening With Your Girlfriend
[Sometime after the Detective Interrogation]

After school he spends time with his girlfriend.

017 Little Sister Can't Sleep
Late one night his Little Sister sneaks into his room scared by the thunderstorm. She complains that he hasn't been spending as much time with her before he went to highschool. Actually the storm was only an excuse since they haven't even spent time together since he "joined the soccer team". She makes sure to remind him that he doesn't need to get a girlfriend since he already has her. Suddenly the thunder strikes and she asks her if he can pat her head just like he used to.

010 Sick Little Sister Roleplay
Coming back home he sees his sick sister waiting her him. She recently found out about his girlfriend and goes on an temper tantrum. When Senpai refuses to comply things get out of hand quickly.

002 Missed Calls From Your Girlfriend
The episode begins one day after his death. Delusional his girlfriend decides to dig him right back up and take him home.

038 Clingy Little Sister Helps You Sleep
Oniichan has been taken back home by his Little Sister. She explains its all right now and even decides to cuddle with him. After he's asleep she decides to deal with the "homewrecker".

Cellphone Girlfriend
They share a bond strong enough for him talk about his family troubles. Despite the roadblocks in their relationship they have always reconciled and made up for it.

Little Sister
Ever since she was born he spoiled her for every second he could. Though he loves her its certainly not to the extreme that she does. After finding out that he lied to her jealously begins to grow out of control.

Trivia
Oniichan is possibly based on another character from Higurashi, Hōjō Satoshi. Both share a loving younger sister that soon reveal a much darker side of their personality.