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
Yeah, I really racked my brain on that one. There is a superhero named Xray, but it isn’t a satisfying option. Xavier is actually really good, I don’t know why I didn’t think of that, professor X, easy to remember.