Neonsei

Neonsei, real name unknown, is the diswoned, neon brother of Sensei. He is so named 'Neonsei' as he is neon and was related to Sensei. He became neon when he ate two much coloured snow. He ws disowned when he was 20 for nearly killing his parents.

Trivia

 * Techinically he is not related to Sensei as he was disowned.