In the patch note for the update next week Jesse wrote:
The daily login character for March will be an all new unit that recovers quickly from debuffs and deals potent AoE damage.
The new unit is the Magmatrooper. He's a Resilient Attacker that recovers quickly from debuffs and deals potent AoE damage. His abilities include dealing physical damage to enemies with a chance to damage another, deal physical damage to all enemies and remove turn meter ignoring armor, and gains turn meter whenever he resists or suffers a negative status effect.
So just log in every day and get a free character! Thanks CG! Much appreciated.