Nut case
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Nut case is pejorativeslang for a person displaying insane, lunatic or eccentrichuman behaviour.
Dangerous
Nut case can refer to someone who is deranged and dangerous. Some colloquial substitutes for this meaning are: crazy, looney, weirdo and headcase.[1]
For example: Charles Manson is a nutcase because he killed several people.
Whimsical
Nut case can be used more whimsically to refer to a person without a mental illness, for instance in the case of a foolish person. Words that can be used to describe a whimsical nut case are: crackpot, crank, nut, fruitcake, screwball, flake, geek, lunatic, madman, maniac or oddball.[2]
For example: Jason is a nutcase because he always wears his shirt backwards at school.
References
1. Strobel, L. et al. (2002). The Case For Christ. ISBN 0310246083 Quotation: "There are a lot of nut cases running around who don't end up in mental institutions."
2. Roos, P. (2006). How to Take Charge. ISBN 1933255099 Quotation: "Sometimes I think that my husband is a nut case."