Otenko

Master Otenko (おてんこ さま, Otenko-sama) is a character from the Boktai series. Otenko is the terrestrial embodiment of the sun's will, and Messenger of the Sun. Otenko aids Django on his quest, serving as a mentor. Otenko also played partner to Red Ringo, Django's father. In the first Boktai game, he was petrified by Carmilla, yet his soul is sealed away inside Sabata. When Django defeated Sabata near the end of the first game, Otenko was set free. During a conversation with Hel, it was revealed that Otenko knew about Django and Sabata being brothers the whole time. In Boktai 2: Solar Boy Django, Otenko was sealed away in Black Dainn's body. When Black Dainn is purified, Otenko is released. In Boktai 3: Sabata's Counterattack, Otenko also decides to sacrifice himself to seal the Eternal, Vanargand, but is saved due to his strong bond with Django. Otenko acts as a mentor & guide to Django throughout the entire series. Otenko would never admit it out loud but he owes Django his life as Django has saved him on many occasions (at least once per game).

Relation with MegaMan Battle Network (series)
Otenko first appears in Battle Network 4 in the Undernet as part of a mini-quest to acquire the "S. Sensor" item and activate the PileDriver, and Battle Network 5 as a "Crossover Points" Trader. Later, he appears in Battle Network 6 as a Battle Chip that powers up other non-dimming Battle Chips as long as it still exist on the field.