This is Delta Sans from what I gathered online. You can either hang out with him, fight him in a YOMI Hustle type battle, or like, idk turn his goofy ass into bone meal for your sugar cane farm. Really doesn't matter. Don't expect him to be too accurate, or at all.

Also, check out and feel free to read his description, I was very unserious and bored so I just had fun writing his backstory, and yes, it does contain some thing I do believe and heard online, specifically the "Sans is from Deltarune"

That's about it, enjoy him I guess