Plankman is shown to be a very grumpy and cowardly plankton. He almost always runs off angry or crying after his news reports. When he doesn't, though, he usually just makes a comment on the report and ends the broadcast.
- In New Plankton Invaders, it is revealed that he apparently have a shelter behind his desk.
- When he isn't angry, grumpy, or sad, he usually is abnormally happy.
- He has 3 split personalities.
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