Iroi Best Team Compositions

Shinku is an Cosmos Esper, allowing for the Blossom Esper Cycle reaction when paired with Iroi. As a on-field DPS Esper that wants to rampage against her enemies, Shinku will benefit greatly from Iroi's Healing and damage buffs. Shinku also allows all characters to gain Ultimate charge in a Charge team ( Cosmos + Anima + Lakshana), instead of just the on-field character, which can help Iroi use her Ultimate more often, making her Healing or Ultimate damage even more consistent.

Nanally is an Anima Esper, so while they do not trigger reactions when paired together, they both provide Blossom Enhancements. All they need is a Cosmos Esper to trigger reactions. As Nanally is a main DPS esper she's able to be on field while Iroi stays as a support.

Zero is a Cosmos Esper that functions largely off field, but works great for creating reactions with Iroi. Having Zero on the team allows Blossom to be triggered very consistently, as Zero's Skill instantly fills the Cycle gauge for a quick swap to spawn another Blossom. Additionally, Iroi's support skill heals the whole team, relieving Zero of the duty of healing with their Cycle Enhancement.

Baicang is an Incantation Esper, allowing for the Hexed Esper Cycle reaction when paired with Iroi. Baicang builds up power words as he fights, which drains his own HP. While he is able to restore HP with his ultimate if he builds Bless power words, having Iroi with him means that he doesn't need to worry about his own healing and can focus on building the more damaging power words, while Iroi will keep him alive.

Sakiri is another Incantation Esper, allowing for the Hexed Esper Cycle reaction. Sakiri also provides team-wide ATK buffs, which will buff both Iroi's damage and healing. Sakiri also provides enemy grouping with her Skill, which can help keep enemies inside Iroi's Dream of the Ivory Gate damage area, Iroi's Ultimate.