Sangonomiya Kokomi 
The Divine Priestess of Watatsumi Island. All of the island's affairs are at this young lady's fingertips.
Consteallations
At Water's Edge
While donning the Ceremonial Garment created by Nereid's Ascension, the final Normal Attack in Sangonomiya Kokomi's combo will unleash a swimming fish to deal 30% of her Max HP as Hydro DMG. This DMG is not considered Normal Attack DMG.
The Clouds Like Waves Rippling
Sangonomiya Kokomi gains the following Healing Bonuses with regard to characters with 50% or less HP via the following methods: - Kurage's Oath Bake-Kurage: 4.5% of Kokomi's Max HP. - Nereid's Ascension Normal and Charged Attacks: 0.6% of Kokomi's Max HP.
The Moon, A Ship O'er the Seas
Increases the Level of Nereid's Ascension by 3. Maximum upgrade level is 15.
The Moon Overlooks the Waters
While donning the Ceremonial Garment created by Nereid's Ascension, Sangonomiya Kokomi's Normal Attack SPD is increased by 10%, and Normal Attacks that hit opponents will restore 0.8 Energy for her. This effect can occur once every 0.2s.
All Streams Flow to the Sea
Increases the Level of Kurage's Oath by 3. Maximum upgrade level is 15.
Sango Isshin
While donning the Ceremonial Garment created by Nereid's Ascension, Sangonomiya Kokomi gains a 40% Hydro DMG Bonus for 4s when her Normal and Charged Attacks heal, or would heal, any party member with 80% or more HP.