Leo would likely take charge. He'd be calm on the outside but worried inside. He'd make sure Donnie gets proper rest and tries to organize the others to help. Raph might be a bit gruff at first, but he'd actually be really concerned. He might offer to get supplies or guard Donnie while he sleeps. Mikey would be the most emotional. He'd probably be constantly by Donnie's side, trying to tell him jokes to make him feel better.
Splinter, as their sensei and father figure, would offer wisdom and comfort. He might have some traditional methods to help with Donnie's pain and healing. And he would also use this as a teaching moment for all of his sons about the importance of caution and looking out for each other.
One common plotline could be the other turtles trying to take care of Donnie. They might struggle with understanding his illness at first. For example, Mikey could try to make his favorite pizza to cheer him up but Donnie doesn't have an appetite. Another could be Donnie trying to work on his inventions even while sick, which might make his condition worse. And perhaps there's a search for a cure within the sewers or with the help of their human friends.
In tmnt female Donnie fanfiction, the theme of empowerment is quite common. She is often shown as a strong character who can hold her own against villains. Her skills in combat, which she may have developed differently from the male Donnie, are highlighted. Additionally, themes related to family are also present. Despite being a female in a male - dominated group, she is still very much part of the turtle family, and stories might explore how she contributes to the family dynamic and how the family supports her in return.
Obviously, his brothers are very important. Donatello would be crucial as he could try to diagnose Leo's illness. Raph would be there to provide protection and strength if any threats come while Leo is vulnerable. Mikey would be the emotional support, trying to keep Leo's spirits up.
Well, Leo would be the calm and collected one showing concern. He'd organize everything from Mikey's care to the security of their lair. He might also give Mikey pep talks about getting better soon. Raph would show his concern through his actions. He'd be the first to volunteer to go out and get anything Mikey needs, whether it's medicine or his favorite food. And Donnie would be constantly hovering over Mikey with his medical equipment. He'd be making sure Mikey is taking the right medicine at the right time and monitoring his progress closely. All of them would also share memories with Mikey to keep his spirits high.
One great place to find tmnt female Donnie fanfiction is Archive of Our Own (AO3). There are numerous stories there with different plotlines. Some might focus on a female Donnie's adventures in the sewers of New York, while others could be about her relationships with the other turtles.
It could be April. Since she's a human and often involved with the Turtles' adventures, she might be an easy target. Maybe the bad guys convinced Mikey and Donnie that April was in some way endangering them.
While Mikey and Donnie are the main focus, sometimes their older brothers Leo and Raph can also play important roles in the fanfiction. For example, they might be searching for the missing baby turtles, or they could be the ones who teach Mikey and Donnie important lessons when they finally reunite.
One key moment could be the build - up to the kiss. It might involve a lot of stolen glances, and small moments of connection between Donnie and April. For example, when Donnie saves April from a dangerous situation, and they share a moment of intense eye contact. Another key moment could be right after the kiss, when they both realize the significance of what has just happened. There could be a moment of shock or disbelief, followed by a shy smile. Also, a moment where they decide to tell or not tell their friends about their new relationship could be important.