I'm not sure of specific fanfictions about Adrien and his dad switching bodies off - hand. But you can try searching on popular fanfiction websites like Archive of Our Own. Just type in the keywords 'Adrien and his dad switch bodies' and you'll likely find some relevant stories.
One way to find 'Adrien and his dad switch bodies fanfiction' is to join relevant fan communities. For example, on Reddit, there might be sub -reddits dedicated to the fandom. Post a request there asking for such fanfictions. People in the community are usually quite helpful and might point you in the right direction.
Another option is to look on Tumblr. There are often fans who share and recommend fanfictions. Search for tags related to Adrien and his father, and then specifically for the body - switching concept. You may have to dig a bit, but you could find some great stories this way.
One possible plotline could be that they initially struggle to adapt to each other's lives. Adrien, in his dad's body, might have to deal with the pressures of running a business, while his dad in Adrien's body has to handle school and social life. This could lead to a lot of comical misunderstandings.
One popular one is 'Body Swap Chaos' where Peter and Tony wake up in each other's bodies and have to figure out how to handle their daily lives and superhero duties. It's full of humorous moments as they struggle with the differences in their physical abilities and knowledge.
I think Iron Man and Hulk would be a really interesting pair. Just imagine Tony Stark's brilliant mind trapped in the Hulk's huge, rage - filled body. He would be constantly trying to find a way to control the Hulk's strength and not go on a rampage. And Hulk in Tony's body would be so confused by all the technology and might accidentally set off some of Stark's weapons.
Maybe the joke is 'Why is Hawkmoth always so stressed? Because he has too many akumas to manage!'.
Since I don't know the specific content of this fanfic, it's hard to give a detailed summary. However, if we think about it, perhaps in the story Adrien uses cat puns to amuse his dad. It could start with Adrien seeing a cat and then coming up with a series of puns based on the cat's behavior or appearance. For example, if the cat has big eyes, he might say 'Dad, that cat has eyes like saucers, it's so meow - velous'.
The main characters are clearly Adrien and his dad. Adrien is the one who has the cat puns to share, and his dad is the recipient of these puns.
Well, perhaps Adrien has been reading a lot of cat - themed books or stories that are full of puns. He decides to tell his dad these puns to brighten his day. For example, he says 'Dad, I heard that cats are great at multi - tasking. They can nap and look cute at the same time!'. His dad might then join in and they could have a fun time coming up with their own cat puns.
Well, they could be in a situation where their body switch affects their Pokémon. Maybe their Pokémon don't recognize them at first. Ash's Pikachu might be confused as to why 'Ash' is acting so differently. Serena's Pokémon might also be a bit hesitant to follow the commands of 'Serena' who is actually Ash. This could lead to some comical and also heart - warming moments as they try to regain the trust of their Pokémon while also dealing with the whole body - switch situation.
A cool plot for this fanfiction could be that all the Avengers switch bodies randomly. This would lead to total chaos. For example, Dr. Strange in Iron Man's body might use magic in ways Tony never thought of, messing up his suit's technology. Meanwhile, Iron Man in Dr. Strange's body might try to use the Cloak of Levitation like it's a jetpack. They would have to figure out how to reverse the situation while also dealing with any threats that come their way.
I really like 'The Unexpected Swap'. In this fanfiction, when Draco and Hermione switch bodies, it leads to some interesting interactions with their friends. For example, Harry and Ron are completely bewildered by 'Hermione' (who is actually Draco) acting so out of character. Also, the author does a great job of showing how Draco starts to see Hermione's world in a new light while in her body, and vice versa. It's a really engaging read.