I was often asked by viewiers about this category, Hawkeye%, playing as Hawkeye only. Recenty I've tried to determine the rules for that category and overall run difficulty. Here is the results of my research:

1. Hawkeye% category would be way harder and slower than Any% because of lack of moves compared to Captain America, most important one is dash;
2. Hawkeye is way weaker compared to Captain America, even trying to complete the game without collecting Power Stones (sort of experience) is REALLY hard;
3. And the most important thing: you just can't complete the game using Hawkeye only (by switching hero at the very beginning); that caused by stage called "Houston", there is only one Key Crystal that allows to move up to the next stage at the very end and to get it you need to tackle (grab) the ledge (or what ever it is) as Captain America, Hawkeye can't jump that high.

So basically you can complete most of the game as Hawkeye and just grab Key Crystal at Houston as Captain America, but there would be other questions/problems/rules. By just playing Hawkeye you need to switch to him after every stage. By uniting heroes another annoying thing shows up, you need to switch to Hawkeye at the beginning of every stage. And red alers...eh, there is no way to make TRUE Hawkeye%. If only someone will find the way to skip Houston or it's exit trigger, grab Key Crystal there as Hawkeye...I will add such category, otherwise I won't.