Hmm...I don't know. Even though it's been said a bunch of times that they both like each other, I don't really know much about Slo Mo except that he's a zombie and that, like I said, he has a crush on Ghoulia. I could see her being with someone who's fleshed out a lot more, but not with a character like Slo Mo. Especially since she's one of the most, if not THE most popular MH character. All those points apply to Ghoulia x Don as well.

Conclusion: Probably not.