If you're looking for anime similar to Momotarou Densetsu: 4-koma Gag Battle, you might like these titles.
A childless woodcutter and his wife adopt Momotarou, a foundling child who springs from the inside of a peach. The super strong child defeats Lord Brindled Dog, Lord Monkey of the Mountain, and Lord Pheasant of the Moor, who agree to become his travelers companions as he sets out to defeat all the ogres from nearby island of Onigashima
Keisuke is a fifth grader who does not believe in ghosts, UFOs, or even youkai. Lately, he has noticed that Natsume has been coming home late, and one day decides to tail her. When he discovers that Natsume goes to a youkai detective agency, Natsume is forced to involve Keisuke in her activities.
There used to be a boy who could control youkai with a mysterious watch. However, he became unable to see youkai when he became an adult. With the boy's duties finished, the watch was buried away in space-time. Then 30 years later, quiet everyday life comes to an end as a fateful day begins with a comet drawing near. The terrible youkai virus Onimaro infects people's malevolent intentions and spreads infinitely. The one chosen by the yo-kai watch is the one who can save humanity from its crisis. The bond between humans and youkai may be recovered with the attainment of a new youkai watch.