Mephistopheles

Mephistopheles was a demon native to YGGDRASIL.

Background
The demon in question was an NPC in YGGDRASIL, called Mephistopheles. He was a character who was famous for spouting tsundere lines to good-aligned beings. He looked fearsome but was surprisingly friendly and logical, and he gave out missions that ranged from rewarding to high-level, which made him almost as popular as the Dark Young.

Personality
Mephistopheles was atypical from regular demons as he strove to be good and was known to be a helpful NPC that assisted players.