Kuboyasu Rean

Rean Kuboyasu (窪谷須 廉庵, くぼやす わあん ) is Aren's father. He first appeared when Kusuo and the gang went to Aren's house.

He quit his gang after Aren was born but keeps evidence of his gang life around his house.

Trivia

 * His name is an anagram of the Japanese transcription of the English word "clairvoyance."