Being trapped in the doll for years drove Alberto insane, putting on an overly cheerful facade to hide the immense pain and anger of being imprisoned in his doll body.
When Luna reunited with him years later, she immediately realized that Alberto is too far gone. She caught onto the fact that he wants to do a soul transfer even if that means forcibly stealing her body.
Comments
In reality, Luna’s mother forcibly transferred his soul into a doll. He has stayed confined to the doll ever since.
Notes:
*Alberto’s design is based off of Mexican Lele Dolls
*Like Luna, Alberto has a Behemoth Form (more on that later).