The protagonist is surely an important character. His inner world forms the core of the story, so understanding his personality, motives and growth is key.
Another theme could be the struggle with one's own psyche. In the light novel, the character may face various internal challenges that are symbolized as 'dangers'. For example, dealing with insecurities, fears or unacknowledged desires. It's like a battle within the heart.
I'm not entirely sure specifically about a 'hara hara mahadevaki animation story' as it's not a very common or widely known mainstream one. It could potentially be a regional or very niche animated story related to some local mythology or cultural context.
Given that the title contains 'Mahadevaki', she is probably a main character in the 'hara hara mahadevaki animation story'. There may be other characters as well, perhaps friends or foes of Mahadevaki. Maybe there's a wise old mentor figure or a villain who tries to stop Mahadevaki from achieving her goals. But without more knowledge about the story, it's hard to be certain about the other main characters.
Well, without prior knowledge of the 'hara hara veera mallu real story', one can only speculate. It might be a traditional story passed down in a particular culture. Perhaps Veera Mallu was a warrior who was known for his bravery. He could have been protecting his village from invaders, or maybe he was involved in some kind of struggle for justice. If it's a real - life - based story, it would likely have elements of the local history, values, and the character of this Veera Mallu figure.