Falfarea was a member of Malebranche. He is also one of the members who were plotting to overthrow the True Demon King. He is also known as the "Laughing Demonic Clown". Mira notes that his power seemed on par with a Paladin.
Falfarea appears to have a similar appearance to a Grim Reaper, except without the scythe.
Falfarea has a scheming personality. In his initial appearance, he acts polite and pretends to become Yui's friend in order to make her lower her guard in order to kill her and Mira. However, Yui -whose Thema is "Friendship", meaning it's something she doesn't have- sees through all of his attempts to use Illusion magic on them and responds by killing him.
As user of Illusion theme, Falfarea stay safe by using his own illusion in his place. So usually what his opponent think they've killed are only another of his illusion and he will keep coming back. Levi also commented that his magic is really troublesome.
- Schalloch Oresteia - Falfarea causes an illusion to manifest. In the manga, it is shown that Mira's body is cut from multiple corners, Alikino bites Yui's right hand and Her chest is pierced by a conductor baton. Falfarea remarked that true illusion will swallow reality into it, probably meaning his illusion is so realistic it can't be differentiated from reality.