Anime is ambiguously real, but video games are based off history, right?

A lot of people portray Alphyne’s child with Undyne’s glorious mane, and who can blame them? But imagine if you will, that Alphys and Udnyne’s son or daughter was instead born with Alphys’ head spines instead, and they would look something like a mixture between those and Undyne’s ear fins. Fabulous in its own right.  One morning, their little child says something like, “I wish I had hair like you momma,” to Undyne. Undyne reassures them that they’re beautiful just the way they are and she wouldn’t change a thing, but the kid says, “but I want to brush my hair and have you braid it like me and mommy braid yours.” Alphys and the kid playing with Undyne’s hair, adorable right? So, Undyne gets an idea and she picks up the kid and they both go find Alphys. Undyne asks Alphys to help her make their kid a wig out of Undyne’s own hair, that way they would have hair just like momma’s.  When you think about it, Alphys has experience with making wigs. Or at the very least, one very glamorous and sturdy one; unless Mettaton’s hair is something ridiculous like hard plastic or fiberglass. So Alphys phones up Mettaton, who has extensive experience caring for, styling, and generally looking glamorous with a wig, or multiple after he got to the surface. So Alphys and Undyne make the kid their very own wig of momma’s beautiful hair, with momma Undyne rocking the shaved look for a few months, and Uncle Mettaton comes along to teach them all about how to take care of their wig, how to style it, how to make it stay on their head, and generally how to work it. And it is fabulous. And since hair is a renewable resource, they can easily make a spare after Undyne’s hair grows back.