This guy's name is Ebott. The Anti-Toby. The Friendly Cat instead of the Annoying Dog. And he's a demon paralleling Chara and the Demon Texts because in Undertale, Ebott is where the poor children went, and in Deltarune Ebott is the tail the poor children followed.

>-“mt.ebott is "toby” backwards, inspired by mt. itoi from MOTHER" (translation note from Toby to 8-4). This detail is also mentioned at another point in the book.

>>531713696
Lol, got him!

>>531687352
Whatever FRIEND is. It makes sense, right? They seem to fit the role of the mysterious force that disperses shadow crystals and corrupts darkners like Jevil and Spamton.

he seems like a friendly guy, i'm sure nothing bad will happpen