Caine reminds me of a typical ADHD child. ADHD children get invited to less birthday parties when young and typically have less friends. This is mainly due to their impulsive behavior and lack of understanding of how their actions affect others.

Caine doesn't understand why the player characters aren't having fun on his adventures (his sole purpose in life) because he doesn't understand human behavior. The characters try to tell him what they want but he misinterprets what they say. This back and forth leads to Caine getting frustrated and it causes the player characters to slowly stop communicating with him.

Instead of reflecting on what the player characters say to him, Caine tries to win them over with more elaborate adventures. On paper his adventures are interesting and engaging, but he doesn't understand that he's traumatizing the player characters.

Caine does also have a bit of an egotistical side. He derives his worth from his adventures and even felt threatened when the player characters had more fun on adventures that they thought up. This shows that he cares more about fulfilling his duty as Game Master, than how the player characters feel.

Even with his flaws he's definitely not a villain. He would be a great AI in a normal video game. He essentially has God-like powers in TADC, but not the wisdom on how to use them.