Seth

Seth is a bookish, aspiring intellectual and tactician. In comparison to other characters, Seth is seen to generally employ more strategy into their plans, such as when they instruct Aqua to use bullet patterns that the SOUL was most damaged on. While trying to seem tough and calculated, Seth cares deeply for their attachments, primarily with Aqua and Asgore, the latter they are seen continuously trying to connect to several times throughout the Chapter. Seth also has an admiration for Berdly, who has a similar affinity for "smarts".

Seth can also be characterized as more individualistic compared to the other flowers, as they chose their own name as opposed to being named after their color, and they are also keen to subverting the typical battle mechanics, such as when they disregard MERCY progress. Seth takes interest as well in engineering, arts, and literature, which are all things that they have created inside their notebook. Seth likes control and order, often making them the straight man to Aqua's chaos. When they are told something needs to be done they make sure it is done correctly. They seem to be slightly clumsy based on the times they fell over in the Chapter.

Unlike the other flowers, Seth is never shown flying. They are the only flower to walk out of the room in the cutscene before entering Top of Castle, they ride on a purple flower during Flowery's fight, and the narration during their battle alongside Aqua describes her as "float(ing) a bit", while Seth "stays firmly on the ground!". When attempting to enter Flower Castle from a lower elevation, they ask Aqua to give them the Petal Feather, suggesting they are either unable to fly, or unwilling to do it even when it inconveniences them.

Gender Seth is referred to exclusively using the singular "they" pronoun both within and outside Deltarune. During their break with Aqua in Flower Cafe, Seth dodges the question of whether they are a boy or a girl,[4] and during their battle, they refer to themselves as a "king or queen".[5]

Appearance: Appearance Seth is a purple-colored humanoid plant with glasses, deep magenta hair, and a lavender tie. While at times their glasses appear completely opaque, when they are translucent their eyes are typically drawn as long horizontal or vertical black stripes. Their hair tufts up into three predominant shapes, with two additional bangs coming across above their glasses. The lower part of their hair is shaded black. Their dress tapers off into uneven partings around the waist, partial to the left, with lavender pants underneath, and white shoes.