He first appeared in the episode "Boredomm"
When he first appeared in the show, he had the appearance of Adeline from the Kirby series. He had this design for a good while until season 4 came, he had been changed to a more original look.
He also made a cameo in The first episode of Hika in the city, where he could be seen riding a subway train.
Jeremiah's Season 2 - 4 design dosen't have white on the bottom of his shirt.