You have all the different legends and all the different challenges wouldn't it be nice to be able to separate your champs by putting them in a group (you can give a name yourself). When you are picking legends for a fight they also display in these groups with the group name. The legends that are not in a group are at the end of the list. This would be easy to locate the legends you want to use for let's say the spiders den. 

What do you think?