Gaelion/Relationships

Naofumi Iwatani
While Naofumi is technically Gaelion's master, the dragon see him more of a parental figures. As such, he craves and competes with Filo for Naofumi's attention. After Gaelion started misbehaving due to lack of attention, Naofumi eventually learned to take care of him.

Ren Amaki
At first, Gaelion did not like Ren and refused to let the Sword Hero ride him. This was likely due to Ren killing Gaelion's namesake and elder personality - father Gaelion. However, they seemed to have made amends since they later teamed up to defeat Leludia - the dragon emperor in Takt's harem.

Wyndia
Wyndia named Gaelion after her adoptive dragon father. While she doesn't know it, her father's ego lives within Gaelion and secretly looks after her. While Naofumi is Gaelion's master, Wyndia is Gaelion's caretaker and speaks on his behalf.

Filo
Filo and Gaelion both see Naofumi as their father and thus compete for his affection. Making the conflict worse, filolials and dragons have a natural hate for each other. They constantly seek to one-up each other to Naofumi's annoyance.

Demon Dragon Emperor
Gaelion despises the Demon Dragon for possessing him after he had eaten the Demon Dragon Emperor core. Even when the heroes wanted to intentionally revive the demon dragon, Gaelion did his best to prevent it from returning to life. The demon dragon considers Gaelion an annoyance more than anything.