How do you use Gaster?

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And another question, why does ink sans throw up ink?

Sans has a tendency to get too excited about things. He happens to sometimes randomly vomit ink, mostly when he gets too emotionally shaken, whether from passion or shock. Ink approaches enemies carefully. Regarding this, is sans the only monster who bleeds? But bottom line: Sans is not the only monster that bleeds. Monsters can and do bleed.

In respect to this, why does kris rip his heart out?

And when Kris shields Susie from the King in one of the game's final cutscenes you're not in control because your soul is almost vanquished. So at the end of the game Kris rips you out of himself to perpetuate the cycle of inevitable violence that exists between Humans and Monsters. One may also ask is ralsei a dreemurr? Ralsei's name is an anagram of Asriel. This references Asriel Dreemurr, who is a major character from UNDERTALE. When Ralsei removes his hat, he appears to bear an uncanny resemblance to Asriel, appearing as a small, white goat. Flowey is another form of Asriel.

Thereof, is ralsei white or black?

It is very clear that at the end of the game Ralsei has white fur. It's black fur. The entirety of the hat makes it look like a shadow, but it wouldn't have also changed his eyes and facial features if so. Is Ralsei Kris brother? Ralsei Is Asriel's 8 Year Younger Brother While Kris Is Ralsei's 2 Year Younger Brother.