woobie

(US, childish) Any object, typically a blanket, garment or stuffed animal, that is used simply for its comforting characteristics; a security blanket.

(US, intimate) Term of endearment.

(fandom slang) A fictional character, often morally grey or a villain, subjected to constant stress and angst, so as to create pathos within the narrative and increase the reader/viewer's emotional attachment to them.

(US, military slang) A poncho liner.