In order to unlock the Character Token for the Invisible Woman (F.F.) destroy silver padlock on the cupboard in first room. That's all!
Deadpool Red Brick
Find the room with Dr. Strange, then switch into Sandman and pass through the sand-wall on the right side. After that choose any character with telekinesis power to open the chest. Destroy all the objects in this area and build the Christmas tree from the remains.
Choose any character with a web attack, then pull the attachable point to obtain the "Fast Build" Deadpool Brick.
Stan Lee in Peril
After you scare away Dormammu from the shower, switch into Spider-Man or Venom and use the sixth sense. Now find the web handles - pulling them will create a hole in the ceiling. Go through it to the upper level.
To rescue Stan Lee, choose character with rocket attack and shoot at the silver padlock on the coffin.