Ruby Resnie is a rising high school junior from North Crosburg, Earth. She is ESME's main offense role. She is one of the central characters.
Ruby is witty and incisive, if not snippy. She doesn't know this, but she works to make people dislike her so that she doesn't feel as bad when they do. If not that, she wants to be seen as powerful. She takes this out on the monsters she encounters. Her best friend is Avery.
Ruby is a tall, slimmer, white girl that wears a red and maroon striped crop top and arm warmers, jeans with stars, red shoes, and a red headband.
| Age | 16 |
|---|---|
| Gender | Cisgender female |
| Element | Oxygen (0.25R, cyan, pattern  ) |
| Aliases | None |
| Occupation | Student, employee at ESME |
| Residence | North Crosburg, Earth |
| Relationship status | Single and hesitant to mingle |
| Orientation | Lesbian |
| Religion | Atheist |
| Voice actor | chezmaibestfriend |