Gren  

Gren, often considered Irias' older brother and a skilled hunter, was actually hinted in episode 5 to potentially not being her sibling but rather her onii-san - a term used for close older male figures in Japanese culture. Despite this, he played a significant role as Iria's mentor, teaching her about hunting and serving as an apprenticeship guide. He wore similar clothing, including a blue cloak, hair beads, and a unique pendant, which was later discovered by Kei.