Spoiler
Actually yes, Gabby is an imaginary character made by Michael when he is still a kid. In the game if you got happy ending with Gabby route , Michael will meet someone who looks visually the same with Gabby and they end up just being friends T_T
Huh, I didn't know it was based off of a game. I was wondering why other students seemed to not interact with Gabby. Plus, he seemed to just be there for support. Why did they make it seem like he was real? So, that means that the father's wish wasn't granted.
Now I'm curious about the game
At the second reading, I just realized that Gabby's character is quite suspicious. I doubt that he's actually real. Is he just Michael's imagination or something? :/