The NATO phonetics are so tired and old. This one uses popular fictional characters instead:
Aladdin Buffy Cruella Dorothy Edward Fiona Gandalf Hulk Igor Joker Kermit Lilo Mufasa Naruto Olaf Pikachu Quark Rapunzel Scoobie Tigger Ursula Vegeta Wolverine Xena Yoda Zorro
If Cruella was written with a K, it would be pronounced the same, too. A certain amount of phonetic redundancy is pretty normal for alphabets that weren’t purpose-made for that specific language.
Is Zena a word or relatively well-known name?
I suspect that’s why NATO uses Charlie. No other letter is pronounced ⟨tʃ⟩ with any significant frequency in English.
Can I suggest Chucky?
Edit: actually, even better: Chewbacca.
Check out Zena Warrior Princess.