So, as a kid, I used to have a face changing keychain. Unfortunately, I lost it, so I can't use it as an example, but I found images of similar products.
These would work great with the MD character's super expressive visors.
**I know that sounds bad, but let me explain**
Season 2 would be cool, but we don't have THAT many loose threads. We just have Doll's streetlight ghost thing, and J repairing the ship. We also have the Cyn tail, but that would probably be explored more by my suggestion.
What we need is a slice of life spinoff focusing on the characters' day-to-day life. This would give us more of the characters we love, and also wouldn't be as hard for Glitch to make.