1. Na-adjective (keiyodoshi), Noun which may take the genitive case particle 'no'

   various; a variety of; all sorts of; many (different)

   Usually written using kana alone

   いろいろな国へ行ったがやっぱり日本が一番いい。

2. Adverb (fukushi), Adverb taking the 'to' particle

   variously; in various ways; in many ways

   Usually written using kana alone

3. Noun

   various things; this and that

   Usually written using kana aloneas ...のいろいろ

Also written 色色【いろいろ】iroiro