Each tier has Healers first, Tanks, Damages and Flank at last. Remember that every champion can be good if someone plays it well (well, except torvald). Enjoy the tier list!
The two main healers, Io for the dr, jenos for the damage boost. Inara as the best point tank that can also play off tank with trancherous ground and wall. Bk top damage cuz he's just too OP
Corvus for the combo with jenos, and his capacityu to solo heal. The three off-tanks, Khan, Ash and Raum, who play well on CC. Tiberius and vik, well countered by Androxus but really good at dealing damages if the flank isn't good.
Grover and Damba as main healers that can also deal some damage (Grover can counter raum with rclick).
Terminus and Barik thanks to their very good sustainaibility and damage capacity, second wave of long rangers but not as good as S- tiers (kinessa better than strix, cassie and lian counter drogoz and dredge). Sha lin is good but underrated. Zhin and Moji are really good at low elo, but easily counterable when you come on higher elo.
After all of his nerfs, koa is still a good tank but not as strong as he used to be. Playing him as a point tank with shell shield is pretty much the only way. Here, Grohk is considered as a damage, because as a healer, he's about C tier. Still good in tiny maps. Maeve and Koga are still playable, but aren't "good" flankers.
Ying just doesn't heal enough, and requires aim. Ruckus can be really good if he's played well, but in most of the cases, it's just not worth it picking him instead of khan/ash. Tyra burn monster tends to be bad at higher than gold elo.
Bad healer, but decent flank. Nando is just bad as a tank.
"The guys who will comeback in the next update"
Torvald, sucks at tanking (very low hp), mostly a support. Skye is hardly countered by illumination.