In science fiction, pith helmets can symbolize adventure and exploration. They often evoke a sense of the old - fashioned, colonial - era exploration. For example, in some stories set on alien planets that resemble the jungles of Earth, characters wearing pith helmets might be on a quest to discover new species or civilizations, much like the early explorers on Earth did in tropical regions.
Biker fiction often portrays the biker lifestyle as free - spirited. Bikers are shown as people who love the open road, the feeling of the wind on their faces as they ride their motorcycles. They are often depicted as having a strong sense of camaraderie within their clubs. There's a sense of adventure and a bit of rebellion too, as they might not always follow the mainstream rules.
Dominant biker novels also portray the tough and rebellious side of the biker culture. There are often power plays and rivalries within and between biker gangs. They might fight over territory, or for the respect of other gangs. There can be a code of honor among them, but also a lot of violence and law - breaking activities which are part of the darker side of this sub - culture.
I don't know the story of the helmets kid metal band. But generally, a kid metal band might face some difficulties. They may have to struggle with parental approval as metal music is often considered noisy. Also, they need to find suitable instruments for their small hands and bodies. Maybe they got inspired by some famous metal bands and decided to start their own journey in the world of metal music.
Outlaw biker characters in these novels are generally alpha males. They are confident and dominant. They ride their motorcycles with pride and have a certain code of conduct within their biker community. They might be rough around the edges, but when it comes to love, they can show a surprisingly tender side. In many of these novels, they are also shown as having a bit of a wild past, which adds to their allure. They are often in conflict with the law or other rival biker gangs, which creates a lot of drama in the story.
They usually portray them as tough and rebellious. For example, they often have a disregard for the law in some aspects, like speeding or having a bit of a wild side when it comes to parties. They are shown as independent, not wanting to be tied down by society's norms.
I'm not sure exactly who they are without reading the novel. But they could be two women from different social classes or clans within the Celtic society, and their story could be about how they interact and influence each other.