I don't know much about the Ohka, but a quick checks shows the Japanese plane was much sleeker looking.  There are similarities in the mission but also great differences.  The Natter wasn't a suicide plane, although the risk of the pilot not surviving was great.  The pilot was killed in the first vertical launch test flight.

The Natter flight profile was to launch vertically from a secluded launch site when an Allied bomber squadron was approaching.  The Natter would quickly reach the bomber altitude (25,000 feet), discard it's nose cone and fire its salvo of rockets.  The Natter would then glide (more like dive) to an altitude of 9,000 feet, where the pilot would discard the aircraft's nose, deploy its parachute, and bail out with his own parachute.  They would descend separately for recovery.  In unpiloted tests the aircraft exploded on landing because of rocket fuel remaining in the tanks.  The profile was then changed so that only the tail and rocket engine would be recovery, the fuel tank section being discarded.

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