oni are demons and I just need advice

and if you want background here feel free to skip this tough I have had this character for a year
Core Arc: From Shackled Monster to Free Dragon
Katsuki’s character arc is a subversion of the typical shounen protagonist. Born with immense, destructive power and a flamboyant personality, he seems destined for glory. However, his life is a paradox: while possessing the ultimate ocular ability in the Six Eyes, it was intentionally suppressed by his Hashirama clan to prevent his monstrous nature from unleashing Asura. This left him with a demonic, red-hued Six Eyes that gave him unparalleled perception but no ability to sense spiritual pressure, making him a terrifyingly efficient killing machine with a profound disconnect from the spiritual world and the emotional weight of his actions. His quest for freedom and change is a deeply personal one, a rebellion against the very forces that shaped him into a monster.
Origins and Trauma
Katsuki was groomed from birth to be a vessel for the Hashirama clan, a clan founded to front Asura. This upbringing instilled a cold, brutal efficiency in him. The Hashirama clan sabotaged his Six Eyes, leaving him with immense power and heightened senses but no ability to perceive spiritual pressure. This made him a powerful but psychologically unstable monster. His flamboyant personality is a coping mechanism, a way to project an image of unshakeable confidence to hide his inner turmoil. The constant “aura farms” and violent confrontations further hardened his exterior, leaving him covered in the Sanemi-like scars of his traumatic past.
Relationships and Obsessions
Maki: Katsuki sees Maki as his ideal, a beacon of perfection despite her perverted tendencies. He is fiercely loyal to her, but his inability to understand romantic love leaves him confused by her constant proposals. He finds her perverted comments confusing and embarrassing, but her loyalty and strength are a constant in his chaotic life. He loves the red streak she weaves into his hair, a sign of her care and a rare touch of humanity in his monstrous existence.
Killua: Katsuki’s relationship with Killua is a complex rivalry rooted in a clash of ideologies. Katsuki’s raw, instinctual approach to combat clashes with Killua’s meticulous, strategic mindset. Killua resents Katsuki’s monstrous nature, and Katsuki finds Killua’s rigid logic predictable and boring. Their rivalry is a core element of the story, with each pushing the other to their limits.
The World: Katsuki’s worldview is defined by his desire for freedom. He sees the exorcist college, the Ministry, and the clans as a system of oppression and control. He longs to break free from these shackles and achieve a state of true, untethered freedom, a goal embodied by his dream of becoming the Dragon Lord.