Typhoeus has a F2P team available with Fluorite and Antal as her source of Nature Infliction. Fluorite can apply Nature Infliction with her Battle Skill, and Antal can reapply it with his Combo Skill, triggering an Arts Burst that provides 1 Sign for Typhoeus.
Perlica and Ardelia can be played in the flex slot, as Typhoeus can deal damage within the short window of their debuffs.