Onu is very focused on the survival and well-being of himself and his sister and can come across as more hotheaded and rash in spite of how careful he tries to be. Dei prioritizes her well-being significantly less than her brother and is instead more intrigued by the nature of Mind Link. Dei comes across as more content and collected than her brother in spite of how careless and hyper she is. Dei's carelessness and tendency to wander is a point of contention among the two siblings.

Onu is a SuperGod and Dei's brother. Onu is incredibly focused on the survival of himself and his sister and is paranoid of what might potentially erase the SuperGods from existence. This contrasts with his sister, who is not afraid of "dangerous" entities, does not particularly care about her well-being all that much, and is more interested about the very nature of Mind Link. Onu sees Mind Link as a very useful asset to monitor his sister’s health and location. He does not care at all about Mind Link’s origins—Onu is just very grateful that he had the ability and takes advantage of it to help protect his sister. But in his opinion, knowing the origins of Mind Link is substantially less useful than making actual use of the ability.

In spite of how careful Onu tries to be in any given situation, he always sustains many injuries from his surroundings and frequently gets attacked by wild organisms from the Transcendent Ecosystem. In one such incident, Onu was swarmed by a large swarm of angry Paxgods who apparently decided that omnipotent^1 alomic entities were not big enough meals for them. Onu does not know why he gets attacked so often or why he often trips when navigating. Onu tries his absolute best to watch his surroundings and to never provoke other entities in order to prevent injuries in the future, but this cautiousness rarely aids him successfully. Because of how often he has to heal himself after getting hurt often, Onu has essentially become a self-taught SuperGod medic. Unfortunately, this expertise came at the cost of any hint of Dei being actually worried over Onu’s health—seeing as he almost always fully repairs himself even after receiving severe injuries that would normally completely incapacitate or kill other SuperGods. Onu resents Dei for somehow very rarely coming into harm in spite of her recklessness and lack of thought when approaching situations. However, he was also secretly glad that Dei never took the abuse he always had to face. Onu still fears that sooner or later, Dei would sustain a severe injury and possibly perish so whenever Dei runs off, Onu always tries to follow her so that he could protect her if he can.

If Onu had his way, the Twins would stay within the confines of their safe home cohort of monocosms, sheltered from the dangers that lay beyond. Similar to his sister, Onu is aware of his twin’s emotions always, even from afar. Onu is not particularly sympathetic towards Dei though and sees her as an idiot with a universe for a brain who invested in silly hobbies that waste valuable metatime. In return, Dei thinks that Onu is overprotective, clingy, and desperately needs to relax.

Onu often complains toward his elderly and incredibly patient neighbour Tris about his sister. It’s possible that Tris had learned to tune out Onu’s complaints so that they did not register, but the experienced SuperGod always maintains his stances and tries to provide the much younger SuperGod with advice that he learned from his experiences. When the advice does not work out for Onu, the young SuperGod would often complain about Tris to Dei for never providing useful advice.