Leanne

Leanne is former member of the hero party until it was disbanded due to Arios lost his status as a hero from his betrayal.

She was betrayed by both Arios and Monica for being useless to them, as well demonized by Monica. She was killed by Rein (unwillingly) to put Leanne out of her misery. After her death, Leanne was later buried by both Rein and his companions.

Her death (along with Aggath's demise) has caused Mina to betray Arios and formed an alliance with Rein after she realized how evil he truly is where she also died at Arios' hands.

Appearance
Leanne is usually seen in a mage outfit with long purple hair. She wears a large hat.

After being demonized by Monica Eclair (who was ordered by Arios of betraying her), Leanne became monstrous until reverted back into her original form when Rein killed her.

Personality
She is haughty and arrogant and like the others looked down on Rein. But she still admitted that Rein's skill of taming Strongest Races are impressive as far apologized to him when accepted her defeat at his hands (unlike Arios who refused to accept his defeat).

She was shown to be devastated when Arios betrayed her and the other Heroes but still sided with him. Like Aggus and Mina, Leanne now has hatred towards Arios for his betrayal and after he let Monica of betraying Leanne without a second thought where Leanne turned into a demon by Monica and killed by Rein and his companions.

After became a demon due to both Arios and Monica's betrayals towards her for being useless to them now, Leanne became a mindless monster when she lost control herself and struggled by her newly transformation, until Rein and his companions to put Leanne out of her misery and freed Leanne when Rein (unintentionally) killed her after Shroud failed to try convincing Leanne that Arios was only using her as pawn all this time and there isn't a way to change Leanne back.

Abilities
Leanne was an accomplished wizard indeed. She was able to cast a large amount of spells which put her way above the average wizard, but much like the other members of the hero party, her skills, for which she called herself the strongest magician in the world, were immediately proved to be a weakling when she only learns are such weak magics and is not even close to those of Tania, whose magic was so much stronger than Leanne's that not only managed to effortlessly nullifying every one of Leanne's weak spells, but then managed to fool her by casting a powerful spell through which Leanne, along with Mina, was left completely helpless.

After she was demonized by Monica (who disposed of her under Arios' order), Leanne gain superhuman strength and caused Rein to struggle. But she was nonetheless killed by Rein (which was unwillingly and unintentionally).