The Omni-shots.

I once had a nightmare where a chomper was eating me alive and every time I see it I remember that nightmare even thought it was six years ago.

I just appeared so I would disappear for another 500 years again.

.

Without Batman, Batman wouldn't exist.

Frisk

"Yeah, midmortal is trash."

Immortal in season 1:

How did I not think about that?

I AM NOT A MORON

Ultra instinct.