Well, she might first be really surprised. Maybe she tries to study it. If it's a magical tentacle plant, it could start communicating with her in some way, like through telepathy. And she could end up on an adventure to protect the plant from those who want to use it for bad things.
The significance could be that she is chosen in a way. Maybe the tentacle plant has been waiting for someone like her to find it. It could be a symbol of her new journey or discovery. For example, it might lead her to a whole new world of magic or mystery that she never knew existed before.
She takes the puppy home and asks her parents if she can keep it.
He might explore the spaceship out of curiosity. Naruto is always eager to learn new things, so he'd be all over the controls and strange gadgets inside. He could accidentally activate something that sends out a signal, attracting either help or danger.
The baby might have some special powers that start to show up. Yami Yugi has to figure out how to control and help the baby develop these powers in a positive way. For example, if the baby can create portals, Yami Yugi will need to teach it when and where it's appropriate to use such a power.
Well, in many such fanfictions, Naruto might take the fox kit under his wing. He could start by trying to find out if the kit is injured or lost. Maybe he'd use his own experiences of being an outcast to empathize with the little fox. He might try to protect it from any harm in the village, as the villagers often misunderstand things related to foxes due to the Nine - Tailed Fox incident. And who knows, the fox kit could turn out to have some special powers or a connection to Naruto's own chakra.
Well, Naruto would probably immediately try to free her. He's the kind of person who can't stand seeing someone in distress. He might use his ninja skills to break the chains quietly if he's worried about enemies nearby. Then he'd likely ask her who she is and how she ended up there.
Next, Sirius might immediately send for help from other members of the Order of the Phoenix. He knows that Hermione's knowledge and skills are crucial for the fight against the Dark Arts, so he wants to ensure she gets the best care.
In the fanfiction, Loki could take Peter under his wing. He has a lot of power and knowledge, so he might train Peter to be more confident and able to defend himself. Loki might also use his magic to make Peter invisible when the bullies are around, so Peter can avoid them until he's ready to face them. And Loki would definitely give those bullies a stern warning in his own menacing way.
There are many possibilities. Maybe Ash discovers that Drati's injury is part of a larger conspiracy. Or, it could bring Ash and Drati closer together as they go through this ordeal.
Well, in the fanfiction, Harry might first try to find the owner of the cat. He could use magic to see if there are any identification spells on the cat. Then, he might take it to Hogwarts. The cat could be a magical cat with special abilities, like being able to talk or lead Harry to a hidden place in the school.