Beware of the man who speaks in hands.

I have an Undertale server! I made it because the one I found has, like, 4,000 members in it and that’s terrifying. Go there to talk with me and other Undertale fans!

Don’t really know who you mean by “that good boi”, so I’m just gonna assume it’s Gaster.

When he’s stressed, he definitely paces around a lot.

Don’t worry, he doesn’t do it in situations where it’s socially unacceptable. He’s learned to control it due to… Past experiences.

Something he always does, though, regardless of whether or not it’s socially acceptable, is space out.

Usually, when he does this, he can’t be productive. He’ll just... Stop whatever he’s doing to internally freak out for a few... Hours?

But when he does force himself to do things in this state, only 2% of his focus is on whatever he’s doing. He just rolls with it & assumes 2% would be enough.

Spoilers: it usually isn’t.

Like... He’s absentmindedly talked to other monsters in Wingdings instead of English before out of pure stress.

As for when he’s nervous, he tends to... Go quiet.

Y’know how Sans’ pupils disappear when he’s angry? That happens to Gaster whenever he’s scared or nervous.

Also, if he does end up speaking while he’s nervous, he stutters, and his voice gets quieter. The more stressed he is, the harder it is for him to form properly-flowing sentences. This tends to happen when he’s talking to people he isn’t comfortable around.

If he speaks to you without stuttering, that means he’s completely calm in your presence. And that’s saying something.

Also, he just gets really jittery. It’s like what he always says: “Who needs heroin when you’ve got adrenaline?”

bonus image under the cut! (eyestrain warning)