In middle school, he met Jose and they became very good friends. He also met Mabel and they were very compatible. In high school, Mabel's best friend Jessica moved back to Riverview. Mabel and Jeremiah started dating after they went to a formal together. After that Jose and Jessica became a couple as well, which Jeremiah and Mabel didn't really think to much of it. After they all graduated, they moved in together. However, seeing each other at school and hanging out is very different than living together.
Jeremiah is very focused on cooking and wants to master the culinary arts, and Mabel wants to master the arts. Jessica is shown to be very controlling and hot-headed. She doesn't admit it, but she wants to control Jose's life. Jeremiah and Mabel want to save their relationship before they break up and ruin their friendship. Interestingly enough, he has the option to ask Jose to break up with Jessica in "Friendly" social options.
Jeremiah is very nice and outgoing. A great cook, and likes vehicles a lot. He also does not like to be naked when he takes a shower. He loves the color lime green which you can definitely tell from his outfits which almost always include lime green.