Anything I should take into account?
Only do it as a counterpick.
If the enemy has non skillshot CC they will stomp on you and you won't be able to harrass them properly.
Now, if they don't then you can max Q first and make life hell for them.
belated edit - and what the guy below me said, too. Counterplay not allowed in this meta, nope.
I stomped Gragas and Veigar once with Fiora mid..
I try to go Fiora mid but it's kinda hard convincing people for that role. Most likely they'll call you a troll. I've had this one person who banned Fiora just because I called her mid.
Also, I recommend going mid only when your top lane is an AP like Vlad or Kennen. An AP jungler might be good too.
For mid, I go get lunge at 1, then E followed by W. I'm most on maxing W or E first depending on enemy.
Also, try to dodge skill shots from enemies like Morg, Lux, or even Ahri.
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