That's the thing that gets me -- getting new characters can be really frakkin' hard in this game! Buying Chronos Stones is expensive, and saving up enough Chronos Stones to get more characters also takes forever (5-10 per achievement, and 1000 needed for a 10-person draw with a guaranteed 5*). Luckily, this is the only gotcha element of the game and is not only optional, but largely insignificant to the rest of the game.
I actually pre-registered the game but never started playing until two days ago. Because of that, I got 2 extra characters off the bat -- both of which were physical fighters (Miyu the Rune Knight and Benedict the Woodsmith/Warrior). So for now I am lacking a magical or defensive character, hahaha...
EDIT: I just realized I had a free draw ticket for 10 characters. I got a few new ones, including my first 5* character (Lokido) and one mage character (Erina).