I'm not entirely sure specifically what a 'colleen wing abuse fanfic' is. It could potentially be a fan - created fictional work related to a character named Colleen Wing that involves some form of abuse in the story, but without more context it's hard to say exactly.
No, it's not appropriate. Abuse is a serious and often disturbing topic, and if it's being used in fanfic in a gratuitous or inappropriate way, it's not acceptable. Fanfic should generally promote positive or at least ethical values.
I'm not sure specifically which 'Colleen Wing punish fanfics' are considered good. You could try searching on fanfic - specific platforms like Archive of Our Own. They have a large collection of fan - made stories and you might be able to find something relevant there.
Colleen Wing doesn't obtain the Iron Fist. In the comic universe, the Iron Fist power is usually bestowed upon specific individuals, and Colleen Wing isn't one of them. There are established storylines and character developments that don't lead to her having this ability.
Colleen Wing does not wield the Iron Fist in comics. The power of the Iron Fist is a specific trait given to certain characters, and Colleen Wing is not among them. However, she has her own unique skills and storylines within the comic universe.
You can start by looking on popular fanfic websites such as Archive of Our Own (AO3) or FanFiction.net. These platforms have a wide variety of fanfics and might have some related to Colleen Wing and the concept of punishment.
Love might also be a theme. Maybe a story about them falling in love in a fictional scenario, with all the ups and downs that come with a romantic relationship. For example, how they overcome misunderstandings and grow closer. It could be a really sweet and engaging story.
Love and friendship are likely common themes. Since they are two characters that fans are interested in together, stories might revolve around how they form a bond, whether it's a romantic relationship or a really deep friendship.