Often, there will be a mentor figure, perhaps an older super soldier or a scientist who was involved in creating the super soldiers. This character can play a crucial role in guiding the main super soldier character.
There could be a protagonist who is a super soldier with extraordinary abilities. He or she might be leading the charge against the antagonists.
The skeleton soldier is obviously one of the main characters. There is also likely a mage or some sort of guide figure that helps the skeleton soldier on its journey in the story.
I'm not sure exactly, but it might have a strong - willed soldier as the main character.
In the 'Rune Soldier Light Novel', there might be a young and determined character who is the main focus. This character could be a novice in the world of runes at the start but gradually becomes more powerful. There may also be a mentor - like figure who guides the protagonist in understanding and using rune magic. Additionally, there could be antagonists who oppose the protagonist's growth or use of rune magic for their own nefarious purposes.
I'm not sure specifically as I haven't read it. But it could be a young protagonist with a special ability related to super evolution.
I don't have enough information to say who the main characters are. It could be a young hero or heroine who discovers the super cube.
They are often highly trained and physically fit. For example, they might be like John Kelly in 'The Cardinal of the Kremlin' who is a Navy SEAL with exceptional combat skills and intelligence.
Gohan and Piccolo are also very likely to be main characters. In the related movie, they had important roles, so in the light novel, they should be prominently featured as well. They both have unique powers and personalities that contribute a lot to the story. Gohan is a half - Saiyan with great potential, and Piccolo is a Namekian with his own set of skills like regeneration and powerful energy attacks.
The super soldier themselves is usually quite interesting. Their struggle with their new - found powers and the responsibilities that come with it can be really engaging. For example, if they were an ordinary person before becoming a super soldier, they now have to adapt to a whole new way of life.
Goku is surely one of the main characters. He is the protagonist in most of the Dragon Ball series, and in the light novel, he would continue to be a central figure in the story, with his never - ending pursuit of getting stronger.
There's also Gohan, who has great potential as a half - Saiyan. He often has to balance his human side and his Saiyan heritage. And then there's Piccolo, who, although not a Saiyan, plays an important role in the story, often helping the saiyans in their battles.