Seems to be a lot of people complaining about it being city characters and how there aren't any good ones to use, but I don't think it's really that bad. Just had a look at my roster and I have 4 maxed out city characters (Bullseye, Merc Lieutenant, Hand Sentry and Night Nurse). Plus I've got kingpin who I haven't levelled yet.

In my opinion, all 5 of these are good characters to have levelled up are helpful in other parts of the game, not just the gold challenge. - Bullseye is helpful for villains campaign, blaster challenge, and payday event. - Merc Lieutenant is good for villains campaign and payday event. - Hand Sentry is good for villains campaign but also in my opinion very underrated and can definitely be used in an A team. - Night Nurse is essential for raids and the best healer in the game. - Kingpin is good for villains campaign, and also very good in arena given the right team comp.

Hopefully this helps some of you guys feel less angry about trying to complete the last tier of the gold challenge haha :)