Gillian, known as Mamoru Hatsugokoro in the Japanese version, is a character appearing in the Tag Force series. He is a Slifer Red student. In Yu-Gi-Oh! 5D's Tag Force 4, his name is given to Yasunobu Hamada. In Yu-Gi-Oh! 5D's Tag Force 5-6, his name is given to Shuji Maruyama.