Natalia Gastiain Tena is an English-Spanish actress and musician who has captivated audiences on both the big and small screens, most notably for her portrayal of the metamorphmagus Nymphadora Tonks in the Harry Potter film series and the fierce wildling Osha in the acclaimed HBO series Game of Thrones. Born on November 1, 1984, in London to Spanish parents, Tena grew up in a bilingual household, spending much of her childhood between England and Spain. This dual heritage deeply influenced her artistic sensibilities, and she discovered a passion for performance at a young age, attending drama classes but largely honing her craft through street theater and independent productions rather than formal training. Her early career was marked by small roles in British television and film, but her big break came in 2007 when she was cast as Nymphadora Tonks in Harry Potter and the Order of the Phoenix, a role she would reprise in Harry Potter and the Half-Blood Prince (2009) and both parts of Harry Potter and the Deathly Hallows (2010–2011). Her portrayal of the quirky, pink-haired Auror won her a dedicated fanbase and established her as a recognizable face in the global franchise.

Following her success in the wizarding world, Tena landed another iconic role in 2011 when she joined the cast of Game of Thrones as Osha, a free-spirited wildling who becomes a protector of the Stark children. Her performance was praised for bringing warmth and toughness to the character, and she appeared in multiple seasons of the series, including a memorable return in 2016. While her acting career flourished, Tena simultaneously pursued her lifelong passion for music. She is the lead singer and accordionist for the band Molotov Jukebox, a group known for its eclectic blend of gypsy punk, ska, and world music. The band released their debut album, Carnival Flower, in the spring of 2014, featuring the infectious single "Neon Lights." They followed this with their second studio album, Tropical Gypsy, released on April 15, 2016, preceded by the single "Pineapple Girl," and they embarked on a tour of the same name to promote the record. Tena’s dual career as both an actress and a musician has allowed her to showcase her versatility, and she has expressed that music remains a central creative outlet for her.

In addition to her most famous roles, Tena has appeared in a variety of other film and television projects, including the science fiction series The Lazarus Project and the drama 10,000 BC (2008). She has also worked with acclaimed director Mike Leigh in the film Another Year (2010). As of the mid-2020s, Tena continues to balance her acting work with her musical endeavors, performing with Molotov Jukebox at festivals and venues across the United Kingdom and Europe. Her ability to seamlessly transition between the worlds of blockbuster cinema, prestige television, and independent music has cemented her status as a distinctive and multifaceted talent in the entertainment industry.