You should get toga, and todoroki on this account, then get black beard so you can easily solo wave 36 on ruby palace infinite insane (20k gold in 13 - 14 minutes)
Sorry but by the third day I played the game (yesterday) I had blackbeard, whitebeard, todoroki, light, and Burma. I've completed story and am level 81. Only played 3 days to get it