|Nickname:||Eugene Chaud, Blaze Chaud|
Chaud is the son of IPC's (BlazeQuest in the English anime) president Shuuseki Ijuuin, and the operator and creator of ProtoMan.EXE. His mother died while he was still young, and Chaud was forced into becoming the vice-president of his father's corporation, a position which contributed to his initial cold attitude towards Lan Hikari. As the series progresses, he gains more respect for Lan, and also begins to open up to others, smiling more often. He does not, however, lose his serious outlook during battle, nor does he act impulsively before thinking.