Run at thing! Jump over them or hit them with your sword!

This description is apt for the whole genre into which Kid Niki: Radical Ninja falls
You are a very silly looking (almost Dragonball Z-esque) ninja in this side scrolling adventure game. You battle enemies with your spinning sword. You can also obtain powerups and other weapons. An example of the light-heartedness of this game: the first end-boss is named Death Breath.

Technical

CPU: Z80
SOUND CPU: M6803
SOUND: 2xAY-8910 and 2xMSM5205 Manufacturer: Irem
Year: 1986
Class: Wide Release
Genre: Adventure
Type: Video Arcade
Monitor: Conversion Class: Irem
Number of Simultaneous Players: 1
Maximum number of Players: 2
Gameplay: Alternating
Control Panel Layout: Single Player
Controls:

Sound: Amplified Mono (one channel)
CPU: Z80
SOUND CPU: M6803