This = コレ ("This" is usually not writen in katakana.)
hiragana katakana and kanji and furigana which is a mix of hiragana and katakana
シマ
You'd write it in katakana: ジェニ
You'd write it in katakana: ジョ
Maggie = マーギ
It is written アニメ
In Katakana "サブタイトル”
ジュース (juusu)
Kimberly = キームバリ
スイート (suiito) would be how you write it in katakana, though 甘い (amai) is the proper adjective for something that tastes sweet.
In katakana, "Kay" would be spelled ケィ