My kid trying on her brother’s Batman costume for the first time. He was a robber who stole some moneybags, but he didn’t get far with Batman on the loose.
My younger daughter recently inherited her older sister’s supergirl costume and LOVES it.

Wonder Woman!
My tumblr is http://thatlever.tumblr.com/
From Chistina: These are some pics of my 2 year old this past Halloween when she was Hulk! Her brother was Hawkeye :)
These are from a Superhero birthday party this weekend, and our girls went as members of the X-Men. Beeg is Cyclops (and you’ll see in the picture that she’s pushing the button to activate her glasses) and Mads is a bad-ass Storm. They were, clearly, a big hit.

My 7 year old daughter, Sakura, wanted to go to the convention as Ahsoka Tano from Star Wars: the clone wars. We’ve put a lot of work into her costume.
Everything was custom build. Her backpack with Rotta in it was made with a simple carboard box and Fimo for the creature. Her lightsaber was made from wood and plastic and lots of paint. The headgear took longest to build. It was created using a wireframe covered in the lightest Fimo you could find. The costume was done by mommy and grandma. Make-up was applied later on.
Special effects added for dramatic effect, of course. :-)
If children end up being a part of my eventual family…this will happen.