(details added)

He's slightly more spiky, and has more power, such as speed, electricity, etc. But when he went through the time portal, all it did was make his body 10 yrs older, he was still actually a 15 yr old. So he handled things differently than the others. He tries his best to be a leader, but with him still technically a teen, and the others being adults, that makes this harder for Sonic to lead correctly, often causing him to make mistakes. He gets the hang of it eventually.

#SonicZ