While Kaj-Erik Eriksen is primarily known for his extensive work in live-action television and film, his involvement in anime voice acting is very limited. He is credited with providing the English voice for the character Proto Man in the anime OVA Mega Man: Upon a Star. This 1995 television miniseries, based on the popular Mega Man video game franchise, featured Eriksen voicing the enigmatic rival and older brother of the titular hero. This role stands as his sole documented credit in the anime voice acting field.

Eriksen's career has otherwise been defined by on-camera performances. Born in Vancouver, Canada, in 1979, he began acting as a child and gained prominence for his role as David Scali on the 1990s ABC drama The Commish. His career continued with notable roles in television series such as Boston Public and the USA Network science fiction series The 4400. He has also made guest appearances in numerous popular shows, including NCIS, Criminal Minds, and Star Trek: Enterprise. More recently, he has portrayed Dr. Oliver Hayes on the Netflix series Virgin River. Despite this extensive filmography, his contribution to anime remains confined to his performance as Proto Man in the mid-1990s.