SPOIL ALERT
a canon idea: susie flirt with toriel. (that animation moment when susie falldown the view say it all)
https://ibb.co/k0Vf69J
another canon idea: the chara smiling firework going back with the team by the conveyor belt (was a kris, susie and ralsei firework show but the last one kris firework turn in a chara smile)

Go commission an artist if you want your idea made. You can hunt around Furaffinity journals, you might even find people taking requests.