I had this same issue recently. In the past my 2nd was easily DeeJay, hes very fun and has good tools for some matches but he doesnt do well against rogs bad matches, and is imo the weakest charge character I would say pick a very strong character in the game, you will have more fun with it. I would say, obviously based off of your level of execution, Akuma, Seth, Adon, Cammy, or Ryu would all be great choices. Recently picked up Cammy and shes very fun. Its a good change of pace from zoning and strong defense to have such powerful mixups and all out offense. Plus her defense is good too, great anti air, cross ups, footsies, etc.