Hmmm well have you heard about 2 types of adjectives: い - adjectives and な-adjectives?
やさし
い人です。
好き
な料理です。
If you believe me or not, suki is an adjective. Here is a great japanese online dictionary:
suki - Jisho.org
As you can see, it is a noun
and a na-adjective. By the way, you can translate here all those grammatical terms you know in japanese into English
But I know you are a native speaker. You just speak, you don't really think WHY you speak like this. It is natural to you