Eaban is a character designed for the game design project Lilyveil. 

Here is his character description from the Lilyveil artbook:

Eaban was Gil’s kindhearted and considerate childhood best friend. A calm and quiet person, Eaban was a good listener who would give the best advice. Despite his quiet nature, he was known as a warm and dependable person by the people of Lilyveil. Three years ago he went missing after suddenly leaving the village to try to find immortality. Eaban’s design is inspired by an imperial tortoise beetle.