in contrast with his cold demeanor, he's quite a friendly and warm person.
in contrast of his cold demeanor, he's quite a friendly and warm person.
in contrast with his cold demeanor, he's quite a friendly and warm person.
in contrast of his cold demeanor, he's quite a friendly and warm person.
the word "in contrast" can be followed by "to" or "with," but the prepositions "for" and "of" are always incorrect after this phrase.