Why would some Japanese write their given name in kana rather than kanji?

In the manga Laid Back Camp we see examples of teenage girls spelling their given names in kanji, hiragana, and katakana.

Rin Shima writes her name: 志摩 リン

Family name in kanji and given name in katakana.

Nadeshiko writes her name 各務原 なでしこ

Family name in kanji and given name in hiragana.

But her older sister writes her name 各務原 桜 all kanji.

Chiaki writes her name in all kanji 大垣 千明 as do a few of the other girls.

Is there any particular reason or is it just a matter of personal preference or what?

by OutsidePerson5