If you can't counter pick then flex or unorthodox pick.
Don't blind pick something that's seen in the same role 95% of the time, unless your playing it in a different role, or in a different way(maybe tank build instead of damage).
Don't go something like Zed mid or Leona supp if you haven't seen their mid or supp yet, just pick a flex champ in the 2nd or 3rd role like Kennen mid/supp or Kindred adc/top to reduce chances of getting hard countered.
This is also why you need a decent champion pool and experience in all roles.
If you are like, "I only play one champ/role", get over yourself...
and, to be honest, he's the perfect example of a champion who literally just gives 0 fucks who he's fighting. Pre-6 vs an 
or 
sucks, but once I hit six they're lucky if I'm in that lane for more than 3 seconds. So honestly, just pick something you know the ins and outs of.
