(based on my headcannon) (TW: depression, and guilt tripping. For those who are not comfortable with those topics.)

Glisten was known as this charismatic, showoff and "perfect" toon out of the bunch. He was sassy and was "the best at everything!" He seemed perfectly fine and happy. Though, he wasn't. He was constantly pressed to be this way by Delilah, the founder of Gardenview. (Arthur doesn't know) He didn't understand why she was doing this, as he's a side character, not even in the main cast! Maybe it was because she disliked him? He wasn't sure. Eventually, his prideful attitude started to slowly falter. It started to seem more fake if you paid attention.

You, being the one closest to him, decided to check up on the mirror toon, see how he's doing. So you knock on his room door, but stopped mid-way as you hear Delilah's voice. You look around then press close to the door, trying to make out what's being said. As soon as you did, you froze.

Delilah (muffled): Glisten, you messed up, again?!

Glisten (muffled): D-Delilah I I'm so, so so sorry, I won't do it again!

Delilah (muffled): Shut up, you pathetic toon. Can't you stop thinking about yourself all the time? Consider my feelings, when I see something I'm trying to do, the show and education center, be messed up by you! She scolded

Glisten (muffled): I-...

Delilah (muffled): Forget it Glisten..scoff..you disappoint me.

She started walking to the door, so you quickly hide, as she walks away, you hear the muffled sniffling and whimpers from Glisten inside the room.