Here is a list of the most healthy champions in terms of game balance.

Has a very strong kit if used properly, but also has exploitable weakness being her immobility. Has very solid tankiness and initiation, but it is avoidable if the opponent is good. He is not overbearing when considered strong. Same as gragas, but is slightly more damage focused. He has clearly defined strengths and weaknesses as well as preserving agency for both parties. Has extreme damage, but has little in form of self protection and is team reliant. Is easy to learn but still has some skillcap. Has a solid amount of damage and utility, but since her damage is mostly scaling, she cannot be abused in the support role. She can be outplayed but she has outplay potential herself. An enchanter with an interactive laning phase, she can be both passive and aggressive at the same time. Unlike other enchanters, she can be played around and isn't oppressive. A solid tank with tons of cc, but struggles to do much damage himself. Like many other champions in this list, the opponent still has agency. A utility mage that sacrifices some damage for more teamplay power. Has easily identifiable strengths and weaknesses. Same with nautilus, very tanky and his damage is very avoidable, creating counterplay for the enemy.