Catherine

Catherine is a human soul that mainly relies on damage mitigation through shields rather than providing large amounts of healing compared to other supports. Despite her heals being relatively low, her shields coupled with her increase in resistences can make the difference between victory or defeat. She also boasts an AoE invulnerability to herself and nearby party members on her subskill Sanctus, which is amazingly helpful if the timing lines up with big enemy damage. While her strengths become less needed as we increase our sync level and become able to burst down more difficult stages, it's undeniable that she's a welcome addition to teams that need her extra defensive power. She pairs well with tanks like Chloe, where Catherine's extra resistence can help Chloe survive enough to proc her own passive regen to survive in the early stages of a fight, giving your dps enough time to get their main skills ready. Her artifact helps boost her heals, but it's a bit unreliable as it's on her subskill. The addition of content where the enemy souls are able to use their ultimate is a huge boost to her viability, since her ultimate can potentially let you tank an otherwise devastating hit from the enemy team. She can be very useful in boss teams where the mechanics require shielding, and for the same reason she's also great in PvP where the shield timing can easily win matches alone.