The fruit's for the devil fruitless Strawhats are cool, and fit them so well.
- Zoro's all about power, so Oda gives him the most powerful Zoan, which are straightforward power type fruits. His swords getting it would be funny, especially since Enma is called a "magic" sword. A dragon zoan with elemental powers would only make it more "magical."
- Nami's the weather goddess, so a fruit which grants her superior lightning based attacks goes hand in hand. And since she'd be a logia, it helps her avoid attacks. Even calls back to her mirage tempo skills which give her intangibility.
- Usopp can hide just about any weapons or tricks he can think of. It adds to his spontaneous combat style.
- The Swim Swim fruit grants Sanji a 360 degree field of attack. He can strike from any direction. The air, the ground, and even underground. Don't forget that the raid suit gives him invisibility, so it's like you're being assaulted by a mysterious force of nature.
I like the decision to have Sanji emulate one of his father's based on the timeline. It was an idea most thought of since the older character concepts, but it's nice to know he's on the same train of thought.
Bad end Sanji truly is "Judge's son."
True end is Black Leg Sanji, heir to Red Leg Zeff.