This simple Superhero Starter Kit has brought so much happiness to my little man. He is obsessed with the red cape and it's accompany wristbands, and will literally dart around the flat in full superhero character. The kit also comes with an accompanying manual about how to be a superhero (and it's quite humorous, I might add). Some of my favourite lines from the manual:
Don't tuck the cape into your underwear. let it flow.
Do eat breakfast. Saving the day takes a lot of energy.
Don't sneeze into your cape! It's just gross.
Available on Amazon.
(thanks for the recommendation, emily!)