Wynn & Wynnda are Sisters, Erial's a Orphan, and Noellia isn't willingly Corrupt......

According to the Duel Terminal Master Guide, "Winda, Priestess of Gusto" is her older sister, and "Windaar, Sage of Gusto" is her father. She disliked being bound by her family lineage and left for the outside world. She doesn't have "Gusto" Crests in her eyes, and she's familiar with "Dragons". In Master Guide 2, she came from the first "Duel World", not "Terminal World".

While all four Elemental Spirit Charmers carry one or two vials in their coat pocket, Wynn is the only to carry another object besides, which happens to be a stuffed bunny doll.

   This could be a memento of her family since her sister, "Winda", also has a stuffed bunny doll in her coat pocket.

According to the Duel Terminal Master Guide, "Ariel" was an orphan from the rampage of "Trishula, Dragon of the Ice Barrier" during the war with the "Fabled", and was taken in by "Gishki Noellia" as depicted in "After the Storm".

"Gishki Noellia" is the leader of the "Gishki" tribe and a former member of the "Ice Barrier" tribe. She plays an integral role in the events of the "Duel Terminal" world's story. These events include:

"Noellia" along with "Gishki Natalia" attempted to summon and control the sealed away "Steelswarm" demons in "Trial and Tribulation" in an attempt to stop the "Fabled" during the Great War. They failed to control them which resulted in the death of "Natalia" (who became a Spirit monster) and "Noellia" becoming possessed by the evil spirit of the "Steelswarm".

After the first "Duel Terminal" war against the "Fabled" ended, "Noellia" took in and cared for the orphaned children as pictured in "After the Storm".

"Noellia" began to become corrupted by the evil spirit and began researching forbidden magic and rituals. She along with some of those children would later form the "Gishki" tribe.

The ritual forced upon her daughter "Gishki Emilia" to turn her into "Evigishki Gustkraken" ("Aquamirror Illusion");

Her transformation into "Evigishki Tetrogre" ("Forbidden Arts of the Gishki") and

The alliance with the "lswarm" tribe, which led to her transformation into a "Gishki"-"lswarm" hybrid monster ("Creeping Darkness" and "Gishki Psychelone").

However, when "Noellia" is freed from the evil spirit, she redeems herself by using the remainder of her power to revive "Gishki Emilia" ("Aquamirror Cycle") and by protecting "Gishki Emilia" and "Gishki Avance" by defeating "Gishki Zielgigas" in "Spell Wall".