
Marina Katsuragi
The main heroine of the first game, and the protagonist Souma’s lover. Possesses high PP and transforms into ExS-TIA to battle against interdimensional invaders.
Kind-hearted, but steadfast in her willingness to fight for others.

ExS-TIA
Marina’s transformed form.

Leese
A knight from another dimension. Level-headed and stout-hearted. Possesses a high amount of magical power, akin to PP, and fights alongside Marina as ExS-TIA Chevalier.
In this game, she has initially returned to her own world to see how things are going.

ExS-TIA Chevalier
Leese’s transformed form.

Azarin
The daughter of the invading Emperor. Though having fought against ExS-TIA before, she has since defected for various reasons.
She is somewhat unpredictable but has adapted to living in modern society. Despite seeing ExS-TIA as her rival, she also fights against the invaders as ExS-TIA Magica.

ExS-TIA Magica
Azarin’s transformed form.

Yuri Amakubo
The scientist who developed the ExS-TIA system. Characterized by her extreme imperturbability and monotone voice.
Is able to transform into ExS-TIA Flora, but only in emergencies. Normally provides logistical support.

ExS-TIA Flora
Yuri’s transformed form.