Tiny Tina is definitely the cutest and only 13 year-old demolition expert I've cosplayed.
I created this cosplay in 1 month and debuted it at Bakersfield Comic Con 2014. It was later worn at Bak-Anime 2015 and Sac-Anime 2015.

The whole outfit was painfully handsewn and then weathered down by rocks, cars, and scissors. It was also cell-shaded with acrylics.

The wig was bought off Amazon from the seller Dream2Reality and was also cell-shaded, nicely spiked, and styled.
Mask was made with polymer clay.

My Borderlands 2 group did a skit that won "Best Entertainer" from BakAnime 2015 and you can see it here (https://www.youtube.com/watch?v=5I5UBuTPT7c)