To write a good 'adam smasher si fanfic', first, you need to understand his character. Know his motives, his strengths, and his weaknesses. Then, come up with an interesting plot. It could be something that challenges him in a new way. For example, a moral dilemma.
Adam Smasher was a full - borg mercenary. He started as a human but gradually replaced most of his body parts with cybernetic enhancements. He had a reputation for being extremely brutal in combat. He worked for various powerful entities over time, often using his enhanced strength and weaponry to get the job done.
The key elements in Adam Smasher's back story include his early life in a tough environment, like street gangs perhaps. His transition to a highly - cybernetically enhanced being is crucial. Also, his work as a mercenary for different parties, which shows his lack of loyalty in a way and his focus on self - interest.
One interesting 'adam smasher si fanfic' story could be about Adam Smasher's origin in a different light. Maybe it shows his early days before becoming the feared cyborg. Another could be a story where he has to team up with an unlikely ally. And there could also be a fanfic that focuses on his internal struggles with his new cybernetic form.