I am extreme good at theorycrafting, tell me a champion, i tell you the final build you must have

Quinn is a generic pure ranged dps, so she is counterable by thornmail and burst. That's why she need to be builded against these counter.

I suggest you to buy , for the tenacity, but also for the 25magic resist which is crucial for adc to counter burst and thornmail. is an important item, it provide you the sustain you need, counter thormnail (%hp portion is not reflected by thornmail) and counter tank. is THE item each adc need. this is an abvious choice no need to argue here is an excellent and underrated choice for adc. it can provide up to 95ad and lot of burster will be screwed, you can bait very easily with the 400hp shield. It also counter thornmail very nicely because the return damage of thornmail is absobed by the shield. obvious choice too, efficent on both squishy and tank, it also counter indirectly thornmail attack speed, movespeed, and 35% crit. obvious choice too on adc.

i suggest hp/lvl on yellow, armor pen on both quint and red, and mr/lvl on blue offensive mastery of course with heal/flash. Potion that give +25 ad if you have 6 items.

With full build and runes, you end up with 2200hp 140mr with 400hp shield and extremly good dps output (430AD with baron/dragon pot, 55%crit, 90%as). Both burster and thornmail user are screwed, so you are not easily counterable.

Let's see how well you do: Quinn

Tell me Elise please.

If you were good at theorycrafting, you would need to know more than just the champion. The lane matchup, the enemy comp, your comp are all vital information for you to know before deciding on a build.

Sona top tank

grant me ur wisdem oh challenjour god