The Call

After the eighth human, Frisk, fell into the Underground, many casualties occurred as a result. Along with the disappearance of the collected souls, the loss of Asgore, Undyne, and many other innocent lives devastated the Underground. No one knew what to do, until Red stepped in, offering to take over in Asgore's stead. Now, Red's goal is to collect enough Human souls to shatter the barrier and exact revenge on humanity for the pain and sorrow that has been dealt on the kingdom.
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Undertale is by Toby Fox

Red is owned by Taxiderby

Neutral Ending AU (and thumbnail) is made by me