So your bar with hero rank progression has 2 states: either number of xp needed for next rank or no number (if you click on it). My suggestion is to add a % of your progression, because on higher ranks (I’m close to 280) you need ~700k xp to next rank.
P.S. I know that color shows how much of your rank is already done, but I would like to see xx.xx% on it too 
I prefer knowing the number rather than a percentage. Like you say, you can already see the percentage, and the number gives you an accurate way to track your progress to the next level. Number is also far more useful if you want to work out how to order the battles you do as you approach the next level to make the most of the tickets you have remaining.
Unless I’m misunderstanding and you’re saying to add a third state where it shows percentage, so you click and it cycles through them all? In which case yeah that would be a nice addition.
Can we fix the poison tick first?
Yeah, 3rd state, I like numbers too, because then I know how many maps I have to do.
Absolutely, numbers are crucial for not wasting tickets. As long as that doesn’t go away, I’d be fine with a percentage too.