Ruby is a smart and curious bunny. She is very responsible, and prefers order and logic when doing anything. She has a motherly nature, in that she watches over Max and only wants what is best for him - but at the same time, as his older sister she can come off as being bossy or overprotective. She handles Max with the best of her capabilities; but often finds herself surprised by him, or actually realizing how much he can help out. At times, Ruby can be competitive, or have her judgement momentarily distracted or clouded by certain things. Ruby lives in the underworld.
She currently attends "Bunny Scouts" which involves activities that uses knowledge and motion. Her goal in Bunny Scouts is to earn every merit badge to fulfill her main goals in life such as bird-watching, being a good hostess, and baking delicious things. She also shows to excel in many things; like selling items, making things, and trying new sports or tricks.
Ruby is dating Sans from Undertale.
Ruby has white fur and black eyes with long gray whiskers. In Seasons 1–2, she wears a purple shirt with a yellow dress on top of it, adorned with green and orange flowers. In Seasons 3–5 she wears a dark pink dress on top of a light pink shirt with daisies on it. And in Season 6, she wears a pink dress with light blue polka dots covered by a lavender cardigan sweater. In Max and Ruby 004, she wears a red dress over a black shirt. In 0004tale she wears a white dress with a blue heart on it over a black shirt.
Ruby has appeared in every episode of Max & Ruby and some Sans fangirl YouTube videos. Her first appearance was in the pilot episode.
- Katie Griffin - Samantha Morton (seasons 1–2; 2002–2005)
- Rebecca Peters (seasons 3–5; 2006–2015)
- Lana Carillo (seasons 6–7; 2016–present)
- She owns several dolls; including Curly Shirley, Rapunzel, Sally
Swims-a-Lot, Pinocchio, Tooth Fairy, Can't-Sit-Up Slug, and several others.
- She seems to favour Curly Shirley.
- Ruby likes Seashells, Peppermint, and Gold Ribbons as mentioned in "Max's Valentine". Did I mention Sans from Undertale?