Iselus

Icelus El-Arde Corwen is Rayneshia's younger brother and is the primary candidate to succeed Duke Serjiad Corwen, although his father Feynail currently serves as his guardian.

He was first introduced in the Log Horizon TRPG supplementary material, but made an official appearance in volume 10's material.

Return of the Goblin King arc
Although Icelus is not officially seen in this arc, he was aware of the Adventurers' help in defeating the main Goblin forces and began idolizing them after that.