Character Card System

I'm definitely planning on leveling characters just for the cards and it sounds like character slots shouldn't be an issue with how character cards work with the world merges coming up (aka I'm getting 12 character slots with no real purpose except card/empress blessing mules). Really that means for me there's no real disadvantage to leveling up whatever except maybe the difference in time it would take to level something like a paladin versus a mechanic to 120, and the fact that I already have a low 100s Demon Slayer and a 120 Jett on my account that could potentially be salvaged into something useful. That said, I'm leaning towards the Bucc/Mech/Jett combo because it's easier for me, I don't particularly want to wait to be able to create a second Demon Slayer and I really have no interest in battle mages.