I've recently gotten back into Baldi's Basics after forgetting about it for years. And in that time I heard that Mystman12 is thinking about adding 19 new characters in the final game for a total of 25 characters. So here is some characters I thought about.

Just a note that I haven't came up with names for them other then the Balloon one.

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Valley Girl - "Once she finds a something that interests her, she'll gossip about it. By god will she gossip."
If she sees you she will run up to you faster then you can run and start fallowing and jabbering for a few seconds, making Baldi always know where you are. After a few seconds she will stop and run off. Unlike someone like Playtime or Dr. Reflex once she's done talking she'll run out of your sight and despawn, not appearing again for the rest of the level.

It's a Mobile Bully/Jock - "Schoolhouse's best sports player! He's also our other Bully because the first one is rather lacklustre in our eyes."
Jock will roam the halls looking for nerds, like you. If he sees you he'll start charging at a alarming pace and if he hits you he'll not only stun you for 5~ seconds but he'll also steal a third of your YTPs. Alternatively if he misses you and smack into a wall he himself will be stunned for 10-12 seconds.

Lunch Lady - "She takes pride in her ability to make food out of anything! Give her a shiny quarter and she'll give you give a fine stew of veggies, porridge, rice, horse meat, potatoes, stuff and vitamin L!"
She will only ever spawn in the cafeteria staying mostly stationery. If you give her a quarter you will be gifted a new item called "Slop" that can either be dropped on the floor to slow most characters down or thrown at them to blind them for a few seconds. However if she sees you doing any of these she will call Principal of the Thing and give you detention. (Fun Fact: I made Lunch Lady in 2020, everyone else here is recent)

Mr. Bigfella - "Don't really know what his job was again. He's just kinda here, and always in the road. I should probably fire him but eh, can't be bothered."
This guy is so big he nearly touches the celling and walls in a hallway. He wonders around aimlessly and at a slow pace. He's not solid and you can just walk through and past him, but due to his size you won't be able to see what's behind him, so be careful.