Delete older characters and remake during April event?

I should look more into this card set

Well, if you have an AB it counts, I believe Xenon can count as well if you plan on making one of those.

and keep the DrK.

I've played one for 6+ years so I am biased. However I have played every other class they've released recently yet I still go back to my Dark Knight. Sure, they aren't super shiny or strong, but they are rather fun and awesome in their own way. Plus, 8 second cooldown on their hyper is awesome.