UPDATED FOR 1.5 😁!
PSA #1: Healers are the white mages of the group, and you NEVER f**k with the white mage (cause they decide whether or not you get up from that charging Stonehide Lawachurl)
PSA #2: Both Qiqi’s abilities scale with ATK. She may be tiny but she’s 100% pent up rage; she’s probably angry cocogoats aren’t real. Elsa ain’t got nothing on Qiqi

Two stages to this healing:
1) Hitting enemies while E is up will heal based off Qiqi’s ATK
2) It will provide healing overtime, whether or not you’re hitting enemies, based on a tick

This is why most of the time Qiqi’s healing feels much more effective than usual. Incoming Healing Bonus% is a rare buff that’s extremely beneficial for overall healing output

IMPORTANT TIP: The healing on-hit is based off Qiqi’s ATK, not the current character’s

Talent Leveling Order: E > Q > Normal
WEAPON #1 (Recommended for that IcyHot relief): Sacrificial Sword
How do I get it D: ? – It’s time to roll boys (gacha)

PSA #3: Sacrificial Sword can make Qiqi’s long CD extremely tolerable (not that it’s that bad). If you have R2+ Sacrifical Sword, take it
Favonius Sword is also a great alternative, which helps tolerate Qiqi’s 80 cost Q. If you have Festering Desire from the event, and have no one using it, it’s also alright for the energy recharge — still highly recommended to use Sacrificial or Favonius though
WEAPON #2 (Recommended for early healing): Skyrider Sword
How do I get it D: ? – You get one from Pan Guan’er, but the rest gacha

Technically, you can run Prototype Rancour if you don’t have any other sword, but you’ll begin to notice the lack of energy recharge (as other than her E, her Q is the only other heal
ARTIFACT #1 (Recommended for focus healing): Maiden Beloved
How do I get it D: ? – Valley of Remembrance Domain (AR 30 locked, 20 Resin per run)

If your team has a shield comp, 4-set Millelith will do much better, as the additional ATK and shield strength far outweighs the little bonus of healing 4-set Maiden provides to Qiqi’s already ridiculous healing
You can technically run 4-set Noblesse if you don’t have anyone else running it, but for maximizing quick heals Maiden is recommended
ARTIFACT #2 (Recommended for early energy): The Exile
How do I get it D: ? – Confront Stormterror Domain (60 Resin per run) or steal some chests

Main stats:
Sands | Goblet | Circlet |
---|---|---|
ER% | ATK% | Healing Bonus% |
Substats: CRIT% > CRIT DMG > ATK (ATK% if not main stat) > ER/EM
If you want other characters let me know. Hope this helped. Bye.