Odin Arrow is first introduced as a classmate of Ava Ire and Maggie Lacivi, however from a different planet. The cover of a student was a facade. His demon is Pedri Nanezgani, and they are not pacted. He speaks with a noticeable stutter that worsens when nervous. He claims to be 16,  but is actually 17 going on 18. According to his sisters, Crow and Raven, he is the most "stupid" of the Arrow siblings. This may be because of his speech impediment.

Odin's associated sin is Pride. Odin has displayed this trait numerous times before, such as refusing to apologize to Maggie even if it meant crashing into TITAN's training planet. He also refuses to shake Gil'shand, feeling that it's 'below him'; this could also be related to Gil's status as a follower, and Odin's personal dislike of TITAN. 

He can be insensitive at times, yet he still is able to see and understand when someone is upset or distraught. After Ava falls from the tree branch, Odin gives her his jacket, possibly feeling guilty for how he was treating her. He also seems to be strategically minded, shown in his attempt to get Ava to hijack the TITAN ship and escape with him as well as their escape from the refugee center.  

He also seems to have a more playful, teasing side, particularly towards Ava, who he seems to get along with despite their arguments. It was also stated that Odin lacks a lot of self confidence in himself and is very insecure. Odin's chosen shape is a square representing his stoic and unyielding personality. 

Even with Odin being both insensitive and abrasive towards others, he still is known to be somewhat self-conscious. This is seen when he reacts embarrassed and saddened by Ava telling him that he smells bad. This also becomes clear when Crow and Raven begin to tease him and remind him about his failure of bringing Maggie to his home planet.  Please Note that he stops stuttering when he is lying.