Hi!! What about some head cannons for underfell gastor?
(Love you and your games!! <3)
He’s a narcissistic ass. There is no getting around this. He’s got the ego of a man who’s never been wrong (although he has), and the stubbornness of a bull. He believes he is superior to every other monster and human.
He’s obsessive. When he finds something interesting to him, he will devote himself body, mind, and SOUL to it. Even if it costs him his life and/or sanity to obtain it, that is a price he’s willing to pay.
These attributes are painfully exasperated with the higher his LVL reaches. After reaching double digits, he’ll occasionally dissociate for multiple days in a row. When dissociated, he goes into “autopilot” mode where he focuses entirely on his research without eating or sleeping. It’s difficult to break out of this state. Usually Sans or Papyrus have to help him.
He can be charismatic and suave when the moment suits him. A lot of monsters in the underground have had a crush on him. He can be flirtatious in a way that people think he’s flirting with them. . . But also maybe not? They can’t outright tell but they do know he makes them feel special. When it benefits him.
The ONLY way he will accept a romantic partner is if they are his SOULMATE. He thinks too highly of himself, and loves his research too much to indulge in anything less.
That being said, his father raised him to conduct himself as a gentleman in public. He will be polite and act respectful, even if he’s inwardly complaining and rolling his eyelights.
He does love his family. Family > Science > Himself > Everything else.
As a romantic partner he’s physically affectionate. He won’t be satisfied with simple hand holding but would crave full on lap sitting while working, or prolonged hugs that turn into nuzzles.
He is either your blanket when sleeping, or you are his. There is no in between.
His narcissism prevents him from feeling jealous, but if he sees someone overtly disrespecting the relationship he will turn hostile.
This hostility can also be triggered by you being hurt, emotionally or physically (Goodness gracious if someone actually laid their hands on you . . . Death would be a mercy).
Enjoys spontaneity over planned events. He may gripe about sudden interruptions from his work, but if it’s to spend time with you or his brothers he’ll secretly enjoy it (the exception being during a dissociative episode).
Is absolutely the type to randomly show up at your work / class and whisk you away from a surprise vacation just the two of you.
Will enable you so, so often. Anything short of life-threatening or harming his brothers, you get his stamp of approval. He will actively help you cause chaos if you want. You want to rob a bank? He’ll be your get away driver. You want to go camping? He’ll learn how to forage. You want to put a whoopee cushion under Asgore? He’ll distract for you. You want to build a solar powered motor bike? He’ll drag Sans in and it is getting done this very weekend.
Loves, loves, loves to tease you. Nothing pleases him more than getting a flustered reaction. Even if you wittily respond back, he won’t stop until he can feel the heat from your cheeks when he nuzzles you.
PLAY THE GAME HERE FOR HIS ROMANCE
