From the 40 ticket chest I got 2 animated characters and one video game character. From my random bronze key I got a music character. I used my silver and gold keys to get two more animation characters in hopes of completing the set and getting the collection bonus. It seems the bonus is based on the lowest level legendary character in your set so even if they’re all level 5 and one is level 1 you’ll only get the level one bonus.

To upgrade a character you need a duplicate of them and to pay Bux. So far it looks like it’s only 200 bux from level 1 to 2 but I’m not sure how much the rest of the levels will be. I doubt it will be only 200 each time though.

Once you’ve made a legendary character 3 you’ll start gaining keys daily. You can use these keys to unlock more of the legendary characters but it looks like the cost of keys to unlock them goes up with each use. (I’m not sure about this, I may have just misread the numbers)

So far this is all I’ve gathered.

It seems like a grinding process. If I could go back I would probably use all my keys to get one legendary character to level 3 so I could at lease get a daily bronze key.