So after watching some Robot Unicorn Attack gameplay on youtube after ages (now seeing that there is Evolution now) I thought up the idea of remodels or reskins based off Robot Unicorn Attack for the Pyro in Team Fortress 2. I myself can not model stuff nor am I an artist so no in depth artwork or anything but still here is my 2 concepts on remodels in text. Edit: I put this up late at night and I'm now expanding on my concepts and changing out some things I think won't work.
Lollichop and Fire Axe
A Futuristic based Axe (The Maul or The Third Degree would be good starting points on looks) with the unicorn horn poking out the other way of the blade/hitting end at the very top along with a flowing rainbow mane (Jigglebones so it flows about like a actual horse mane would make for more awesome). At the end of the handle is a Star and enmarked along the handle visible on the first person view model is the 7 different forms that the Robot Unicorn has in Evolution (one version of the game has the Rhino another the Saber-Tooth Tiger just so you know) being in order top of the handle next to the axe head to the bottom next to the star, Unicorn, Panda, Wolf, Gorilla, Rhino, Saber-Tooth Tiger then Dragon. Lollichop is the Good/Original Unicorn's Pinkish White Metal (even though its no longer a food item) and Fire Axe being the Evil/Heavy Metal Unicorn's Dark Steel for RED also with the Fire Mane instead of the Rainbow Mane. Could also add some animated effects along the like a Rainbow pluse on the Lollichop one or fire flowing up the Fire axe one.
Rainblower and Flamethower
For the Rainblower, The 4 trumpet ends are the heads of the Good Unicorn without Mane (would look kinda silly considering no other head has any long flowing hair), Dragon, Wolf and Saber-Tooth Tiger all open with their Blue eyes, the ball is now made of glass containing a fairy/pixie (animated fairy/pixie = bonus points) and the Good/Original Unicorn's Pinkish White Metal for the colour of the metal. For the Flamethower its the Evil/Heavy Metal Unicorn's head (fire mane could work I don't know) and its mouth open with its blood red eyes for the firing end and the Gas Tank is now transparent (in some way) and within is the Dark Imps aka the fairy replacements from the Heavy Metal Version of the game with lava. You could probably spice it up some more by adding spikes and stuff too but I myself don't really know where. The metal of the Flamethower being the Evil/Heavy Metal Unicorn's Dark Steel. Rainblower has some part of Always by Ensure on loop for the firing sound while the Flamethower plays some part of Battlefield by Blind Guardian on loop (maybe the chorus). I know my explanations were long but I just wanted to go deep into detail also of course you could tone some my ideas down as some of it might be overkill on low end comps. Also I've put up some fan artwork and in-game screenshots for reference however I suck at Robot Unicorn Attack so can't get my own screenshots and some the stuff I found was either not jpg or jpeg or within the size allowance but can be found via google images.