User blog:Miss Misfits/Name in Japanese

Hello! I'm not sure about the way I write the names of my characters. In the info says: "OC's First Name/Second Name (name written in Japanese, Romaji name)"

But what exacltly means japanese? Katakana, hiragana, kanji? For example: Let's say my character name is Hikari, which one should be used?

Hikari　(ヒカリ, Hikari)

Hikari (ひかり, Hikari)

Hikari (光, Hikari)

Let's say we choose the katakana. What happens when it comes with a last name? The last name comes first or in second place?

Hikari Yamada (ヤマダ ヒカリ, Yamada Hikari)

Hikari Yamada (やまだ ヒカリ, Yamada Hikari)

Hikari Yamada (安田 ヒカリ, Yamada Hikari)

Thanks to anyone who answer this.