Mandarin

 From the rumors I heard, all I know is we MIGHT see Matt Murdock (Daredevil) as Peter's lawyer, but no hints of King Pin being in the movie. BUT...  he was rumored to appear in the Hawkeye series, and I have a strong feeling we might see BULLSEYE make a return as well, since he's the only Daredevil villain that can rival Hawkeye's quick reflexes and is also an expert marksmanship. He also impersonated Hawkeye in the comics once, so there's that also.

I'll be honest, I don't know much about Shang Chi either, I just watched the movie for the action only. I liked the actor who played him in the movie, and I really REALLY liked Awkwafina's character in the movie, she's Marvel's version of Harley Quinn for me. But as soon as the FAKE Mandarin appeared, and then they started put a lot of CGI creatures into the movie, that's where the movie started to get boring for me. As for the 10 rings, all I know is that they WEREN'T bracelets that the Mandarin had around his arms, he wore them on his fingers in the comics, I actually didn't mind that change, I thought it made more sense for him to have the rings around his arms. But in all honestly, I don't know know much about the 10 rings or how the Mandarin uses them in the comics