Rosanna: Chic Ocean
The boss of Hedonia clad in a swimsuit. Per Mustang's request, she has gone up to the surface to partake in a magazine photoshoot. Her swimsuit is both striking and audacious, much like her own personality.
- EN：Samantha Berman
- JP：Ikumi Hasegawa
- KR：Lee Eun-jo
- Tetra
- Supporter
- Assault Rifle
- SSR
Assault Rifle
Ammo：60
Reload：1 sec
Burst Gen：0.2 %
Affects target(s). Deals 13.65 % of ATK as damage. Deals 200 % damage when attacking core.
PassiveFerita
Activates when entering battle. Affects all allies. Damage to Parts ▲ 24.26 % for 15 sec. Activates when an ally or self destroys an enemy's part . Affects all allies. ATK ▲ 3 % of caster's ATK, stacks up to 5 time(s) and lasts for 30 sec.
Active30 secSpina di Rosa
Affects all allies. Damage to Parts ▲ 24.26 % for 15 sec. Affects the enemy nearest to the crosshair. Deals 70.4 % of final ATK as sustained damage every 1 sec for 15 sec.
Active20 secOnda Grande
Affects all allies. Sustained Damage ▲ 20.32 % for 10 sec. Affects all enemies. Damage Taken ▲ 32.23 % for 10 sec.
Underworld Queen
A squad formed by Tetra to oversee the criminal underworld in the Ark. Its members run the biggest gangs in the Ark: Seimeikai, Peony Association, and Hedonia.
| Image | Name | Role | Manufacturer | Element | Weapon | Burst LV | Burst CD |
|---|---|---|---|---|---|---|---|
 | Rosanna | Attacker | Tetra | Electric | Machine Gun | 1 | 40 |
 | Moran | Defender | Tetra | Electric | Assault Rifle | 1 | 40 |
 | Sakura | Supporter | Tetra | Fire | Sniper Rifle | 1 | 40 |
 | Sakura: Bloom in Summer | Attacker | Tetra | Wind | Assault Rifle | 3 | 40 |