Treyni

Treyni (トレイニー) is a Dryad that resides in the Jura Forest.

Appearance
She is a beautiful woman who appeared to be in her twenties, according to human standards. Her skin was light with well defined facial features. She was stated to be semi-transparent.

Generally she wears a full length, aqua colored dress with white sleeves and goes barefoot.

Trivia

 * In The Slime Diaries, Treyni is shown to have a fondness for potatoes. She also said that Dryads are born from potatoes leading to the obvious joke that Treyni might be a cannibal due to her near constant consumption of potato chips.
 * Treyni is shown to have awareness of Veldora being eaten by Rimuru, long before Rimuru himself shared the details with his friends and allies. In episode 12 of season 1 of the anime, she even said Rimuru has Veldora's divine Protection.
 * Her personality is almost exactly the same as Rimuru's, except she's way more graceful in avoiding commitments and outright has passed on many opportunities to become a prominent figure herself. This is a constant gag during the anime, in which she acts a voice but passes the mantle of Chancellor, ruler, and later, protector of The Great Forest of Jura to The World's Strongest Slime.
 * Despite being a Dryad, she is shown to have a deep understanding between civilization and nature, and always gives her insight to best handle development of Rimuru City, and later, The Dungeon. Because of this, despite Rimuru City becoming highly advanced, the city lay out is one with the natural surroundings and doesn't dominate the land.
 * She is one of the few monsters to already have a name at the start of her introduction.
 * She is shown to be extremely empathetic towards the suffering of others, later it is revealed she herself is a refugee, taken in by Veldora when Lamrys was killed before the start of the story. Her willingness to help ease the hunger of the orcs has also been endearing to the former enemies to the forest.
 * Her laidback attitude and increasing tendency to involve herself with the affairs of Rimuru has been a point of envy towards her two younger sisters.
 * When reunited with Lamrys, she tends to show a more childish side, but also a more doting side to the Queen of the Spirits.
 * She is extremely addicted to any form of entertainment and helps develop complex traps within The Dungeon. Upon hearing about video games from Veldora, she is shown to have an interest in trying to bring a form of it to her world. This could be seen as ironic, since a Dryad is technically a tree spirit who's impartial to the flow of time. However, Treyni is always in live in the moment mindset and is downright fascinated by technology.