Dic: one of a kind, two of a kind

• She's a very unusual woman, one of a kind.
• As a female engineer who began her career in the 1940s, she was one of a kind.
• They were two of a kind, from the same sort of background.
• Amy and I are two of a kind. That's why we've stayed friends for so long.

PHRASE | If you refer to someone or something as one of a kind, you mean that there is nobody or nothing else like them.

PHRASE | If you refer, for example, to two, three, or four of a kind, you mean two, three, or four similar people or things that seem to go well or belong together.

... Cobuild, http://idioms.thefreedictionary.com/kind