the metal of the Void gear itself sorta slightly resembles Ventus' white and grey vest, the bronze/copper gear like thing sorta resembles the Samurai-like thing he has on his waist, and the way the shaft expands near the end of the blade kinda resembles Ventus' Jacket
Roxas: he was similiar to Terra, in terms of chains of events. His life was pretty much just one big line of bad events. So you have to feel kinda sorry for him. Especially since at the end, all he wanted was him, Axel and Xion to have ice cream again, but that never happened. Personality wise, he's considerate, curious, bright, but not the type that always "looks at the bright side".
Axel: To me, he was the most interesting character. Some things STILL aren't explained about him. He was always pushed the bad stuff to do, so you must imagine if he had a heart, how he would feel.
Xion: She confused me so much, she looked like Kairi, but as the game progressed.I realized how important she was in the story so thus, I began to like her. That final fight with her, on the clock tower, that was by far, the most dramatic battle in KH ever.