I suggest new armors called Paramedic Suit, Emergency or Nurse Suit or so. There could be multiple types, each having 2 or 3 of the following features:
They could be Vitasuit Deluxe upgrades (because it's 4 star).
They could have colored blinking lights, red stripes and Movement Speed Increase (like an ambulance car).
They could reduce the time to take Health and Remedy Capsules.
They could slightly increase the heart drop rate for monsters killed by a hit from the person wearing it (kinda like Seraphynx does, but not as powerful).
They could have exceptional Health Bonus, like Vitasuit Deluxe has.
They could have Poison or Curse Resistance.
They could increase the number of Health or Remedy capsules a player can carry.
They could slightly increase the chance to get Sparks from boxes.
They could heal or grant a bonus to the Knight when they use a Spark of Life on somone else.
Also, I suggest a gun that shoots hearts which heal players and can't damage monsters, like the shots from a love Puppy. If occupying a weapon slot and not being able to use it vs monsters is not enough to balance it, it could also have incredibly slow Attack Speed, needs to be charged or uses the players own health bar for ammo.
The charge shot of the suggested gun could heal like 4 health bars, but the uncharged shot cures all possible status conditions.