Cocytus

Cocytus (コキュートス, Kokyūtosu) is one of the secondary characters of Isekai Quartet.

Personality
A diligent and loyal Guardian to Ainz. Wishing only to bring him success, even in school. He tells his classmates that those with Ainz should bring victory with him. He also takes his job in Gym seriously, and has those with him work very hard. Stating they should be model people and does not excuse those who don't work hard.

Plot
When the class is split into groups, he is placed in the gym committee with Darkness and most of Tanya's subordinates. He elects himself leader,

Powers & Abilities
A powerful warrior and physically the most powerful Floor Guardian. He has strong armor, knows many techniques, and is very dangerous. He is also capable of teaching others.

Darkness
The two are often paired together.