Jingle Jim's real name, Mij Elginj is an evil elf. He was kicked out of Santa's workshop and swore revenge by appearing every 100 years in Christmas. He gives 100 people with one of his 100 presents that twist the wishes they wished for. By midnight, the spell will permament.
He appeared in All I Want For X-Mas where Martin bought last-minute presents from him. Martin gave it to M.O.M., Diana, Java, and Billy and they got their wishes twisted.
They found Mij at Santa's workshop and was statued by snow. Martin used his present to wished for a paranormal Christmas, which reversed the spell.