In a side quest of the first Hyperdimension Neptunia game, you fight a boss called Macaroon. Here's an image of her (unsure if this is from the original or Re;Birth)
In Trinity Universe, she appears as an Inn Keeper (before Pamula takes over) and as a shop keeper (before Violet takes over).
I've played though the Disgaea Games (with the exception to Disgaea D2: a Brighter Darkness, but it was released after Trinity Universe and Hyperdimension Neptunia) and I haven't seen her, so I assumed that she is a Gust character probably from the Atelier series, since both games feature Gust characters (Hyperdimension Neptunia has a character who represents Gust called Gust like how NISA has Nisa).
I thought she'd appear in the Atelier Iris series, but I'm currently on the third one and I have yet to meet her, but I know some of the Atelier Games were never localized and I'm assuming she's from the Atelier series (Gust also did Ar Tonelico and Ar no Surge).
So I am wondering, where does she appear? Or was she an original character only used in cross-over works?