Marie Danielle is the professional pseudonym of Sandra Fox, an American voice actress with an extensive career in anime dubbing, animation, and video games. Her career began in live performance, working for the Walt Disney Company in Orlando in live stage shows and later becoming the official live-action portrayer and voice of Betty Boop for Universal Studios in 1991, a role she has performed for decades. This work led her to Los Angeles, where she transitioned into voice acting after taking a workshop with director Sue Blu.

In the realm of anime, her early major roles included providing voices for the Animaze dub of Akira as Kiyoko and as Lady Aska in the Magic Knight Rayearth series, for which she also rewrote lyrics and sang theme songs. She has since become a prolific voice in the industry, frequently lending her voice to characters in productions by Bang Zoom! Entertainment. Her filmography is extensive, with prominent roles including the robotic Tachikoma in Ghost in the Shell: Stand Alone Complex, Sumomo in Chobits, Paiway in Vandread, and multiple characters in the Naruto series, such as Momiji and Mina. In 2014, she was cast as the voice of Chibiusa, also known as Sailor Chibi Moon and Black Lady, in the Viz Media redub of the original Sailor Moon anime and its companion series, Sailor Moon Crystal. Her work also includes the role of Pixis in the series Dangaizer 3.

Beyond her anime work, Fox has an extensive body of work in video game voice acting. She is well-known for voicing Flonne in the Disgaea series, Mistral and A-20 in the.hack series, Marona in Phantom Brave, and Peashy in Hyperdimension Neptunia. She also voiced the character Lily in the LeapFrog educational videos and toys, often credited as Marie Danielle for those projects. Her voice is frequently recognized for its distinct, high-pitched, and youthful quality.