What is a metaphor for "Your personality is colder than ice"?

A simile is a figure of speech comparing two unlike things that is often introduced by like or as. The dictionary's example is "cheeks like roses." Other examples are "sly as a fox," "old as dirt," and "an expression as cold as ice." A simile compares two items, a metaphor equates two items.

Explanation:

Also you could say there "cold hearted"