A bunch of sites just on characters and teams of Marvel Comics.

Avengers Assemble - Avengers

Avengers Forever - Avengers

Wakandan Embassy - Black Panther

Star-Spangled Site - Captain America

Living Legend - Captain America

Man Without Fear - Daredevil

Elektra Natchios: When Words are not Enough - Elektra

Namor the Sub-Mariner - Namor

Advanced Iron - Iron Man

The Immortal Thor of Asgard - Thor

X-Men Unlimited - X-Men