What changed the most from the old Glitch to the new Glitch Steven?
Well, maybe his gem's super powers and personality.
Personality: In the old ref for example. He was supposed to be shy and have anxiety, why? Because I wanted to talk about social fobia and anxiety and the way he tried to fight with it. But I started to think a lot and I see that it doesn't fit with him. And now he is a social butterfly and want to befriend everyone!
Gem's powers: I make it more simple. I started to think to myself "How a 16-17 years old boy who doesn't leave his own bubble, know that he can can add, remove or modify something even he doesn't know what a banana is?" Or "How he can turn into another person or animal if he never seen one?". The portal thing is a "accident" 'cause he make portals to another world using his mind. It's something like that:
Glitch: Omg... I'm so bored!! I wish I could to have my own adventure in a world with a lot of monster who I can battle or befriend them.
Glitch: Oh. Adventure time, baby!!!