If you're looking for manga similar to Kanpachi, you might like these titles.
Eren and Mikasa enter a new school-- Titan Junior High! However, Eren's hated Titans for years-- can he get along with his new (harmless?) classmates? Featuring all of the characters from the main series as you've never seen them before, this series is sure to delight fans of Attack on Titan with a human vs. Titan volleyball match, a Titan rock band, and much more!
Journey back to Lodoss Island for tales of dragons and dwarves, paladins and princesses, magic and...madness?! All your favorite characters from Record of Lodoss War are back and sillier than ever in this series of madcap short strips that poke fun at all the high fantasy stereotypes you have come to love.