Tatsuhisa Kamijo (上城 龍久 Kamijō Tatsuhisa), nicknamed Luke (ルーク Rūku), known in the English dub as "Lucidian Kallister", is one of the seven main characters in the Yu-Gi-Oh! SEVENS anime. He is one of Ohdo Yuga's best friends and rivals, and schoolmate from the next class over, and the self-proclaimed number one Duelist at Goha #7 Elementary. He is also the younger brother to Kamijou Haruka.
