I only dislike sexualized characters if it doesn't fit their actual persona. Like Pyra in Xenoblade 2. A completely non-sexual character in every way, yet had massive boobs just for the sake of it.

None of them in FF7 match this description though. Scarlett is the only especially sexualized character but it totally fits the personality. She's the dominatrix type femme fatale. Wouldn't work if she was ugly or overly conservative with clothing.