Crystallize

Crystallization is a Quirk that is used by Hojo.

Description
Crystallization is a Quirk that allows Hojo to grow a large number of crystals from their body, completely covering his skin with them. The crystals are shown to be both durable and able to grow virtually instantly.

There does not appear to be any limitations as to where on the body the crystals can grow from. Also, despite their hardness, the crystals are not unbreakable.