Self Roleplay
To Self Roleplay is for one person to be roleplaying by themselves due to either having no partner, or setting a story within their mind for themselves, or perhaps they could be lonely.
It seems Timmy is self roleplaying to ignore the outside world.
Self-Roleplaying
When someone is so lonely in real life to the point where they act out certain things they've watched or read.
Baymax: On a scale of 1-10, how lonely are you?
Jack: I do alot of self-roleplaying.
Baymax: That means level 15
Jack: I do alot of self-roleplaying.
Baymax: That means level 15