Yandere vs. Deranged — What's the Difference?

A character, usually a girl, who has an obsessive and possessive side in regards to their crush, ready to use violent and murderous means to maintain an exclusive bond.

To disturb the order, arrangement, or functioning of

To upset (normal condition or functioning, as of a bodily organ).

To cause to be psychotic or otherwise severely mentally unsound.

Or upset, especially mentally.

Or inoperative.

Simple past tense and past participle of derange

Disordered; especially, disordered in mind; crazy; insane.

Driven insane