It could be Tony Stark. In the Marvel universe, Stark is known for his technological genius. He might design a new suit for Spiderman as a way to upgrade his abilities and better protect him. Stark has the resources and the knowledge to create a high - tech suit with all sorts of advanced features.
The new suit could have the ability to camouflage. This would allow Spiderman to blend into his surroundings, making it easier for him to ambush villains or escape from dangerous situations unnoticed.
One possible new power could be the ability to control electricity. He could use it to stun enemies, power up machinery, or even create electromagnetic fields to deflect attacks. This would add a whole new dimension to his combat style and problem - solving skills.
The theme of temptation is often present. The black suit offers a lot of allure in terms of power and a different way of doing things. Spider - Man has to resist the temptation to fully embrace the more violent and self - serving aspects of the suit. Also, there is the theme of isolation. As he changes while wearing the black suit, his relationships with friends and family can become strained, leading to a sense of isolation.
In fanfiction where Spiderman gets cheated on, it often explores the emotional turmoil he goes through. It can be a way to add more depth to his character. Writers might show his vulnerability and how he copes with the betrayal. Maybe he throws himself more into his superhero duties to distract from the pain.
MJ (Mary Jane) would be a likely character in the harem. She has a long - standing relationship with Spider - Man. Gwen Stacy could also be part of it. And then there might be characters like Felicia Hardy (Black Cat) who has her own complex relationship with Spider - Man. In some fanfictions, other female superheroes from the Marvel universe like Elektra might also make an appearance in the harem.
Peter Parker is obviously a very popular character as he's the main protagonist. He's the one wearing the black suit and going through all the changes it brings.
There's a fanfiction titled 'Black Suit, New Rules' which is really interesting. In this story, the black suit gives Spider - Man not only enhanced powers but also a new moral code. It shows him struggling between the old Peter Parker values and the more aggressive tendencies of the black suit. It's a cool take on the whole black suit concept.
One interesting plotline could be Peter Parker struggling to control the power of the black suit while still maintaining his moral compass. Maybe he has to face off against a new villain who is specifically drawn to the dark energy of the suit.
One common plotline could be the black suit Spider - Man having to protect his harem from various villains. For example, Venom might target the people in his harem to get to Spider - Man. Another plotline could be the relationships within the harem, like how the different characters interact with each other and with Spider - Man. Maybe there's a bit of jealousy or competition among them.