Reg/Relationships

Faputa
Reg met Faputa and Gaburoon shorty after the latter had been damaged by a Turbinid-Dragon. Faputa was at first wary of him, but as they spent time together they grew closer to each other and Reg gifted Faputa the goggles he wore on his helmet at the time as a sign of friendship. After his memory loss, Reg was wary of Faputa at first but as he learned more of their past, circumstances and had minor snippets of memories with her coming back, he grew sympathetic towards her to the point of wanting her to join them. After their confrontation, and reuniting in the climax of the village arc, Faputa and Reg were able to reconcile. After Faputa joined the group, she and Reg were seen to be on good terms.

Human-looking silhouette
During the battle in Ido Front with Bondrewd, Reg wakes up after overcharging and claims to have been controlled by someone among many people who come to his mind, among them the Human-looking silhouette appears implying there may be a connection between them. The silhouette also appears before him in his overcharged state while looking at Bondrewd causing him to get enraged.

Kiyui
During Reg's time in the Belchero Orphanage, he and Kiyui were both Bell Whistle Delvers. They frequently spent time together when Nat and the others are out cave raiding. They appear to have bonded, as Reg made sure to visit Kiyui and say goodbye to him before leaving with Riko for the Abyss.

Lyza
On multiple occasions, Reg receives flashbacks involving Lyza hinting at a connection between the two. While Reg is doing chores for Nanachi, he hears his voice from a memory saying "I'll be going now... Lyza..." and it is transported to a memory of him in front of the Blaze Reap tomb at the Garden of the Flowers of Resilience. After the release of Mitty, during the 2 hour sleep after using the Incinerator he sees a memory of him crying while looking at Lyza's back, Lyza comforts Reg and hands him a bowl of Lyza’s Cooking, she then says "Once you're done eating, we're heading out". Lyza is also one of the silhouettes that appear after the battle with Bondrewd, further implying a relationship. Lastly, as Faputa is fighting Reg, Faputa's memories show that Reg was holding onto the Blaze Reap.

Marulk
Riko and Reg are the first people around Marulk's age coming to the Seeker Camp. Marulk quickly bonded with them and they became friends. During their stay in the Seeker Camp he explained a few things to them. When Riko and Reg advance to the next layer Marulk, together with the other Subterranean Bandits, sees them off.

Nanachi
Nanachi first encounters Reg while he is trying and failing to save Riko's life after their encounter with the Orb Piercer. At first, both Reg and Nanachi tend to be reluctant to show their feelings to each other, but over time they have become close friends and trusted comrades on their journey.

Nanachi doesn't like being touched by him, saying the way he does it is "too lewd". Reg often comments that Nanachi is fluffy.

Riko
Reg supposedly saved Riko from a Crimson Splitjaw in the Abyss's 1st layer. Riko brought him back to Belchero Orphanage while he was unconscious and, with the help of Nat and Shiggy, woke him up. At first, Riko was fascinated by Reg and saw him more as a Relic and advanced machine than a person. However, this did not stop them from quickly becoming close friends and learning to depend on one another's skills in the Abyss. Riko was also the one that gave Reg his name, and he treasures it very much because of that. Over the course of their adventures, Reg's actions and thoughts have shown that he cares deeply about Riko and feels very protective of her.

Srajo
Srajo hosts Riko and her friends, near the entrance to the 7th Layer. She acknowledges the uniqueness of their team, referring to them as "non-pareil" or "without parallel"