Irene is the damsel in distress from this game, she has been captured by the evil (effeminate looking) Lord Klaus. In the game's ending, the Flintlock rescues Irene and sends her back to her planet inside the Flint.
In Otomedius Gorgeous
Irene appears as a reference to Xexex, as an automated distress beacon inside the Crystal Core D-X02. The actual character doesn't make an appearance, but the words she said at the beginning of Xexex plays before the player fights the Crystal Core D-X02. Irene is often mistaken for piloting the coreship because of this, but she's not.