Firstly, I'm a fan of your work here Izabelle! Very fun and creative stuff here!
Wanted to chime in here on Vi, a bit since people are curious about the coincidence. For the official record, It takes us anywhere from 4-6 months to concept and produce a LoL champ.
In Vi's case, she's been aeound in various forms for two years. At one point she was a steam-punk capoeira fighter with dreads and robot legs- which sounds way cooler than our drawings for her! 
A year ago we started exploring a girl with bad ass metal/tech gauntlets but we couldn't find a way to make her compelling. We were running into challenges with Shyvana overlap, as well as struggling to define who she was as a person. Sometime around this past June, one of our champ concept artists took another crack at her- and came up with the punky ex-criminal persona. We all got super pumped on this new direction and began full pre-production.. GypsyLord's first playable protoype came into design playtest in early July- and we had her marquee charge punch ability day one.
When I first saw this thread a month ago, I was amazed at the coincidence! Kudos to you Izabelle for your creativity.
Hope you all enjoy punching people in the face with Vi.