Is the DAUGHTER of the demon lord.
More spoiler below.
She's had crush on Ashnold since long ago and OG Ash seemingly promised to marry her when she's older...
In the OG story she actually dies in the battle between demons and goddess force.
However unlike in the OG where she was in despair after hearing news of Ash's death, since he's alive here she was afraid of dying in battle.
Which resulted in her father taking the attack aiming at her instead.
And now she's the new demon lord (despite her small size she can exert enough pressure to make Ashnold kneel)
Not gonna lie I wasn't expecting some of the development
Like the priestess and martial artist in the hero's party being yuri couple.
Ashnold being cultured enough to decide 'any man interfering between yuri couple deserve to die'
She was the heroine in his heart
Jokes aside people going gaga for unimportant Side Characters is a fanbase classic. I can easily believe that (Since I am guilty as charged)