Here are the rules.
1. Each Sub-Franchise within DC (IE Superman, Batman, Justice League, etc.) gets one character for each decade that it has existed. You can choose whether to count the 2020s as part of the 2010s. Superman's been around since the 30s, so he gets 9-10 characters, for example.
2. You must pick characters that debuted in the different decades that the franchise has been around for. So for Superman, you'd have Clark as the 30s rep, Luthor as the 40s rep, etc.
What Rosters would you make?