Destructive Gigantes highly discourages Light Heroes due to its elemental advantage passiv
Tanks:
As the main tank, this slot must be filled by a non-Light Knight, as otherwise, the damage sustained will be too great. Highly preferred are units able to cleanse Electrocute.
F. Kluri: While her S3 cooldown is rather high, her fast turn cycling and constant sustain make F. Kluri an excellent tank.
Rose: A more offensive option, Rose brings Attack buff, and barriers for additional sustain.
DPS:
Landy, Schuri, Luna
Landy: With strong multipliers, Speed buff, and powerful turn cycling Landy’s DPS is unrivaled.
Schuri: Another strong DPS option that provide continual CR pushing for other members of your team. While his multipliers are not the best, his turn cycling works excellently.
Luna: A powerful single target DPS that can contribute with additional Defense Breaks.
Other DPS: Any Single Target DPS is viable here, although if survivability is a concern, Cermia/C. Dominiel, and other DPS with non-Attack skills may be preferred.
Supports:
Cerise, RT. Roozid, Tenebria
Cerise: Her fast turn cycling allows her to keep Speed Down active on Gigantes, while her S1 triggers additional Dual Attacks, supplementing DPS. Paired with Ms. Confile, Cerise also excels as a Defense Breaker.
RT. Roozid: Decrease Speed, Attack Down, team-wide CR increases, and supplemental self-healing, make RT. Roozid a very potent support. A strong alternative for those without access to Cerise.
Tenebria: Her AoE sleep and decreased Speed debuff help greatly in managing both the cannon and Gigantes, while her Defense Break and decent damage make her a powerful secondary DPS.
Healers:
Tamarinne, M. Hazel, Achates, A. Montmorancy
Tamarinne: As the premier healer of choice, her fast turn cycling, increased Attack buff, strong healing, and Dual Attacks, make her the best healer for this expedition.
M. Hazel: M. Hazel is an accessible and strong choice for healing, providing Greater Attack, reliable healing, and other Fire Hero synergies.
Achates: Achates is a very powerful Healer, able to alternate between her S2 and S3 for strong AoE heals every other turn, and capable of applying Invincibility to the tank.
A. Montmorancy: A pure healing option, her insane healing output provides incredible sustain at the cost of not providing any other support.
Any other healer works as an alternative.