In Hey Arnold Helga Soulmate Fan Fiction, the theme of redemption can be quite common. Helga's character often has a journey of redemption. She starts as a bit of a bully towards Arnold, but as the story progresses, her love for him makes her want to be a better person. Another theme is the power of love to transform. Love for Arnold changes Helga's perspective on life and how she interacts with others.
One common theme is the unrequited love that Helga has for Arnold at the start. It often explores how she tries to hide her true feelings while being mean to him on the surface. Another theme could be the growth of their relationship, from Helga's secret admiration to a more open and mutual understanding.
Well, a frequent theme is the idea of self - discovery. Helga, through her love for Arnold, discovers more about herself. Also, friendship is a big theme. Even though Helga has romantic feelings for Arnold, their friendship is also a central part of the fan fiction. And of course, the concept of soulmates, which implies a deep and fated connection between them.