Tensuke is a character from MegaMan Battle Network 4. He worked as a top maker for 50 years, and his NetNavi is TopMan.EXE, which augments his love of tops. His grandson is Kosuke and he has a twin brother.
Tensuke is showing his grandson, Kosuke, a special CyberTop, but he declares tops are boring and leaves. Tensuke is disappointed and is devastated when the CyberTop has a virus. Lan deletes the virus and talk with Tensuke, who says his makeshift Navi is broken. Lan decides to visit the NetBattle Club and request their help in fixing TopMan. They agree on the condition that MegaMan.EXE answers several trivia questions. If he gets it wrong, he has to give their NetNavis backrubs. The leader of the club is Tensuke's twin brother, a kite maker that has odds with him because Tensuke declares NetBattles stupid. Eventually, they fix TopMan and both Lan and Tensuke are surprised to know they are their next opponent at the Den Battle Tournament. He loses, but his grandson's interest is renewed and he develops a healthy relationship with his brother, or so it seems. They immediately start arguing again after the match.