So Thresh is THE support champ that every support should know how to play, and Lee Sin is the jungling champ all junglers should know. But what about top, mid and adc? Or do those roles not quite have a must-know champ right now?
You don't have to know any specific champ for any role. Play what YOU like and fits your play-style. Don't be forced onto any champ.
Not all the roles have must-plays, like thresh and lee, who just have so much potential but are very challenging to play at that level. But in the spirit of what you're looking for here's my best shot at it
ADC: I think you need 2 adc champs, one who can poke at a distance (i.e. cait) for a poke or sustain lane. and one for kill lanes who will win in trades (i.e. lucian, graves) If it could only be one champ i might take jinx who can sort of do both. A lot of people would say tristana these days too.
Mid: there's a lot of variety in mid. I think popular opinion would say yasuo is the champ you must know, with zed and talon close behind. I would say you must know a champion who can deal with these 3...
Top: currently ryze seems to be shining in top. dealing with those melee bruisers with style, so maybe know him. Also know a way to deal with him, i'm still working on that...
well essentially the meta changes. as for top lane it used to be shyvana you had to know to play. now you have to know to play ryze.
for jungle you have to know lee sin but if u are talking about solo queue i stay away from lee sin. so i think as a jungler it is more prefer for u to learn kha zix or maybe jarvan.
for mid lane it is essential for u to know orianna. she is the most safest champion.
for adc it is obviously lucian.
for support it is thresh or nami. you always need a healing support incase thresh doesnt work out for the comp.(i.e. a weak adc that needs heals)
