About Champion Model Sizes
After the reveal of the new Sion and seeing how absolutely HUGE he is compared to his old model, I realized something that not many people take into account. Champion hit-boxes and model sizes are actually a component of gameplay and not many people realize this. The likeliness of clicking a fully sized Cho'Gath compared to say a small Tristana is definitely not even. It's just basic mathematics and statistics. While the factor may not significant that it dominates gameplay, it surely does create a psychological effect on players. When you are in a team fight and you have this massive Nautilus walking at you in plain view while a Ziggs dwadles behind throwing bombs from a distance, there becomes a certain instinct to aim for the bigger target. Even though you are consciously saying to yourself "aim for the Ziggs, he's the bigger threat, he does more damage", there is that sense of urgency that the bigger champion is a bigger threat, simply by their intimidating size. In my opinion, this is GOOD for gameplay. If the main goal of a tank is to soak up damage for his team, then perhaps by being simply ***large *** they can deter the enemy from attacking his team. While this may be a tiny factor among the many variables in League of Legends, it is still something that I believe Riot can dig deeper into when updating old champions or creating new champions.

. With all said, I think it fits well with the theme of tanks and such.
(mega form obviously)
dragon form,
bird form soaks up the damage of tank and feels a hell of a lot more threatening,

the yeti should be massive, not shorter than most humans,