My Japanese tutor taught me to remember how to write 女 – hiragana ‘ku’, katakana ‘no’ and then the kanji for 1 without the tail (or just a horizontal line).
On the other hand, my favourite kanji to write is either 子・こ, 水・みず (water) or 冬・ふゆ (winter).
Favourite Hiragana to write: あ,し,ま,め,る.
Favourite Katakana to write: ア,タ,ホ,ナ,レ,ン.