Here are all of the secret techniques, boss strategies, banana locations (well, most anyway), and ambush tips that I remembered to record over several playthroughs of Ikiki's Teppoman 2. I've yet to figure out what collecting all bananas in the game does (other than rewarding an extra life for each), so if anyone can help translate the wiki page for Teppoman 2 then do let us know.

Note that viewing the videos posted here will spoil the game completely. Don't watch any of them unless you're completely stuck, since half the fun is trying to figure out the solution to a seemingly impossible challenge.