From Simply Vanilla

Mythsi or "MathisLeMaitre" is a member of the CCCP, he joined the group years ago with his close friends Jung0, CastorSansBarage and Elprospector.

Mythsi specialised himself in the construction of redstone contraptions, farms and "artistic" builds sometimes considered as weird by the other members. Mythsi didn't send any messages in the game chat, making him unknown by a major part of the community, but the CCCP members makes a lot of jokes about him. His hate towards CastorSansBarage is unreachable because Castor is always making fun Mythsi.