What to Character card combo to aim for? What equips to aim for?

Thank you very much! I'll change my 1st 3 card set to the 3 pirates and try to level them all to 100. And I plan on making 7x+ on any new characters that come out in the future at least for their link skills.

Thanks also for the equip help. I guess I cannot at all afford tyrant equips, let alone scrolled/enhanced ones. Guess I'll try to make a good 50b somehow before trying for it.