>>713324604
Why the fuck does Ralsei's version say the second hero is a monster? The actual prophecy just says "a girl".

Ralsei is something Toriel gave Susie (that presumably belonged to Asriel beforehand). Ralsei can stay in the Dark World without Kris, but not without Susie.

FRIEND is the opposite of Ralsei and represents something traumatic of Susie's past. It is likely "the Prince of the Dark" the prophecy is actually talking about. Hence why it shows up in Susie's room in Chapter 3.