Olivia Olson — actress, voice artist and singer-songwriter

Career highlights

Olson's career spans film, television and animation. As a child actor she gained attention for her small but memorable role in Love Actually. In animation she developed a distinct vocal identity for the character of Marceline, performing both spoken lines and songs that became important to the show's storytelling. Her voice work contributed to episodes that mixed humor with emotional depth, and her performances were praised by many fans and critics for their expressiveness.

Music and songwriting

Beyond acting, Olson writes and records music. She has performed original songs in the context of her voice roles and has also released music independently, appearing live at events and conventions. Her work often draws on pop and indie influences and showcases her dual talents as a vocalist and a songwriter. For many listeners, Olson's musical contributions to animated storytelling remain among her most memorable achievements.

Notable roles and appearances

• Marceline (voice) — recurring and guest roles on Adventure Time, including songs and emotionally significant episodes.
• Joanna — child role in Love Actually (2003) and a follow-up short for charity in 2017.

Background and family

Olson grew up in a creative household; her father is comedy writer Martin Olson. That environment exposed her to performing and writing from an early age and informed her later work across multiple media. She continues to work in voice acting and music while making occasional on-screen appearances.

Legacy and public reception

Olson is often cited for bringing warmth and nuance to animated characters and for bridging acting with musical performance. Fans of the shows she has worked on frequently highlight her songs and vocal scenes as standout moments. As a working artist she remains active in recording and live events, maintaining a presence in both the animation community and the independent music scene.