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Isaac'n (あいざっくん Aizakkun?) is a recurring enemy in the Rainbow Islands series. They are small robots modeled after the titular character from the Taito arcade title Metal Soldier Isaac II.


The name "Isaac'n" is a combination of the name "Isaac" and the Japanese honorific -kun (くん?), a suffix used by those of senior status to address those of junior status in a familiar manner, and is often used at the end of young boys' names.

The use of "Isaac" refers to the eponymous main character of the Taito-developed arcade title Metal Soldier Isaac II, upon which the enemy is based. The original game's usage of the name likely comes from prolific science fiction writer Isaac Asimov, who authored many works pertaining to robots and is famous for creating the Three Laws of Robotics.