Mistleteinn

An evil dream demon who appears in the anime. She has the power to force dream demons into human vessels, later targeting and killing them, resulting in the vessel losing all ambition in their goals. She is extremely strong, as it is noted that she is acknowledged by Pharos Hercules for her power.

Appearance
She has blonde hair and green eyes with an strage pupil. She wears a dress that appears to be made of plants, red and black colored. She has 2 vines at her back, that she uses to trap and stab her opponents

Personality
Despite having the outward appearance of a sweet little girl Mistleteinn is a vicious sadist. Mistleteinn is playful in the sense that she enjoys toying with her victims almost as if she was purposely proving that she is a lot stronger and better than her victims before killing them.

Mistleteinn appears to be sustained by killing other dream demons as she hopes that their deaths will fill her stomach. In light of this she does not feel guilt upon destroying a child's dreams and ambitions, in fact her facial expressions and outbursts indicate that she is aware of what she is doing and enjoys it, further highlighting her sadistic tendencies,she is also a cowardly villain who will use dirty tricks for to make her enemies won't attack her(as seen in the final episode when she swallowed Pallette and used her as a hostage in order for to make Merry and Engi won't attack her.)

Powers & Abilities (Spoilers)
Unlike other dream demons Mistleteinn has been described, by Lestion, as being formed by negative emotions, such as hate and spite, in the deepest pits of hell. As such her strength far exceeds the normal dream demons Merry or Engi have encountered before.

Mistleteinn, in her own day-dream, can use water to make droplet projectiles which have a strong impact and can also expand to envelope the victim holding and drowning them at the same time, as seen when capturing Isana to lure Pallatte out.

Mistleteinn also has two leafy stem like tendrils which she uses as ranged and close combat weapons, as we seen her fight Merry with them and she extended them to great lengths to stab Engi whilst she was flying and using her own projectile sword attacks. The stems are very sharp and lethal as they were shown to pierce even Leons metallic armour and later slice him in half.

There is a definite plant like trend in Mistleteinn's arsenal as she can also summon spear or stave like weapons. These like the tendrils are used for both long and short range attacks. These weapons are created by crimson petals which make frequent appearances when we meet Mistleteinn. We also see Mistleteinn use plants to do her dirty work as she creates seeds which grow into enormous flowers which Mr.Ijima calls the 'Bud of Despair', "in which nothing but hopelessness exists". Mistleteinn also uses sharp bud like projectiles which she fires at Yumeji.

In a bid of desperate defence, for fear of death, Mistleteinn displayed an ability to swallow whole other dream demons. It is unknown if there is a size limit however she appeared around Pallette appearing swollen around the abdomen till she compressed her body into regular size. Upon doing this she informed Merry and co. that if she was defeated then the demon inside her would be also.

As mentioned previously Mistleteinn is in a league above the average dream demon, in the sense that her power, speed and defence are exceedingly high. This is verified when we see her counter Merry's fists with a single finger and also breaks Engi's swords with one finger. Also her defence is incredible as when Yumeji attacks her with one of Engi's swords its breaks off her side indicating that she may well be harder than the sword and also Engi lands several attacks and yet Mistleteinn remains unharmed adding "is that all you can do". Mistleteinn's speed is also obvious as she easily dodges the combined attacks of both Merry and Engi.

Ryōta Ijima
Ryōta Ijima is her vessel. Their personalities also seem to be familiar.

Lestion
She murdered Leons former allies. In light of this she has become the target of Leons revenge.

Trivia

 * She is an Anime Only character.