Pour les stands :
[....] In a match, common sense dictates that the physically stronger would win, but I realized that if you add supernatural abilities into the mix, a woman can fight on even footing with a strong male opponent. In other words, if the battle is between those with supernatural powers, physical appearance has nothing to do with strength. The Ripple is Lisa Lisa's supernatural ability. The idea of "looks being irrelevant in super natural abilities" is what led to the introduction of Stands in part 3.
Et en parlant de Ceasar :
[...] I had not only read a lot of shonen manga, but a lot of books as well, and I was never a huge fan of the main character getting some sort of unbeatable, ultimate weapon. He may be stronger than before, but you feel like it's essentially over at that point. I like equipping the characters with weapons with faults and have them try to cover for them through strategy, and I feel like it's more fun to write something where you deal with the different merits and demerits that each of them have. I feel like Caesar's bubbles were a perfect representation of his fate and the burden he was carrying. I was able to play with the visual aspects of them as well by having him morph the round bubbles into discs for his Cutter, or use them as lenses. There are infinite possibilities that can come of a spherical shape like a bubble. I consider that to be a very important aspect of JoJo. Both Gyro in Part 7: Steel Ball Run, as well as Josuke in Part 8: JoJolion inherit these spheres, and my stance on that hasn't changed from when I originally drew Caesar.