Nikka Edvardine Katajainen is a witch from the country of Suomus in the World Witches series, serving as one of the main characters in the 2016 anime Brave Witches. She is a member of the 502nd Joint Fighter Wing, a combined military unit that defends humanity against the alien Neuroi. Born in Helsinki, the capital of Suomus, she entered a training school at the same time her witch abilities first manifested and was trained as a non-commissioned officer. During her training, she already displayed a careless and somewhat destructive attitude, which led to her training unit being completely wrecked on multiple occasions. This tendency toward recklessness and a lack of caution persisted into her later service. She is known by the nickname Nipa. Her character is based on the real Finnish fighter ace Nils Katajainen, and she shares a similar reputation for being accident-prone yet resilient. Physically, she has short blonde hair and blue eyes, stands 1.60 meters tall, and was born on May 31, making her fifteen years old during the events of Brave Witches. Her personality is often described as tomboyish and guileless, sometimes coming across as naive or blunt. She tends to act without overthinking the consequences, which can create chaos but also contributes to her fearless approach in combat. Despite her casual demeanor, she is a skilled Flying Ace and a capable combat witch who fights effectively alongside her comrades. Within the 502nd Joint Fighter Wing, she is attached to No. 24 Squadron, an elite unit of the Suomus Air Force. She shares a close friendship with the squadron, particularly with fellow Suomish witch Eila Ilmatar Juutilainen, with whom she has a long-standing bond. She also becomes a close friend of the protagonist Hikari Karibuchi, serving as a supportive and reliable teammate as Hikari adjusts to life in the unit. Her motivations are centered on protecting her friends and her home country from the Neuroi threat, and she approaches her duties with a straightforward, action-oriented mindset. Her role in the story is that of an experienced yet easygoing senior witch who both supports the newer members and provides comic relief through her accident-prone nature. Her development over the course of the series involves gradually taking on more responsibility and learning to balance her carefree instincts with the demands of being a dependable soldier. Her notable abilities are those common to witches in the setting: the power to use magic for flight via a Striker Unit and to engage Neuroi in aerial combat. She is recognized as a Flying Ace, indicating a high level of skill and a significant number of confirmed victories against the enemy.