Sirius would handle it with love and determination. He'd start by teaching Harry basic things like how to control his magic when he starts showing signs of it at a very young age. He'd also introduce Harry to the concept of good and evil in the wizarding world. Since Sirius has a bit of a rebellious streak, he might raise Harry to question the status quo in the wizarding world and think for himself. He'd be like a combination of a strict father and a fun - loving uncle, making sure Harry grows up happy and strong.
Sirius would probably be very protective. He'd use his magic to create a safe and comfortable environment for Harry. For example, he might conjure up soft, warm bedding for the baby. He'd also try to find the best baby - wizarding supplies, like magic - infused milk bottles that ensure Harry gets all the nutrition he needs.
Sheldon might try to apply scientific parenting methods. For example, he could create a strict schedule for the baby's feeding, sleeping, and learning based on research. Penny, on the other hand, would probably be more laid - back and focus on the baby's emotional needs, like cuddling and playing. Together, they would have to find a balance between Sheldon's rigidity and Penny's spontaneity.
Well, at first, Sirius would be in a state of shock and panic. But then he'd have to step up. Their relationship would shift from one of equals (in a sense, as Harry was growing up) to a caretaker - cared - for dynamic. Sirius would have to learn about Harry's likes and dislikes as a baby. He'd sing lullabies to him, comfort him when he cries. This new experience would make their bond stronger in a very different way. Harry might not remember all of it when he's turned back, but there would be a subconscious change in how he feels towards Sirius, a deeper sense of security and love that stems from those baby - days when Sirius was his whole world.
Sirius could use his knowledge of the wizarding world's secrets. He might know some hidden places or spells that could keep Voldemort at bay. For example, he could put a powerful protective charm on the place where Harry is staying.
Well, Hermione would be a crucial character. She would be the voice of reason for Harry. She might research every possible magical solution to either understand the pregnancy better or find a way to reverse it if that's what Harry wanted. Ron would be more of a wildcard. He might be disgusted at first given his past issues with Draco, but eventually, he would probably come around to support his friend. As for Draco's friends, they could either shun him or support him depending on their own views on this very unconventional situation.
At first, it might be a bit rocky as Sirius adjusts to taking care of a baby. But as Harry grows, they would form a deep bond. Sirius would protect Harry at all costs, and Harry would come to understand Sirius's sacrifices for him. They might have some arguments as Harry gets older, especially when Harry wants to explore more of the wizarding world on his own, but their love for each other would always prevail. Sirius would be the one Harry turns to for advice, whether it's about girls or dealing with dark wizards.
Sirius influences Harry's early life by being a protector. He stands as a shield against any potential threats. He might use his Patronus, a large dog, to guard Harry at night, making Harry feel safe in his sleep.
Loki is known for his mischievous and sometimes devious nature. This might lead to him teaching the baby some tricks that are not exactly 'by - the - book'. Valkyrie, on the other hand, is strong - willed and brave. She would likely instill a sense of courage in the baby. So the baby might grow up with a unique blend of playfulness and fearlessness.
Sam and Mikaela would handle it with love. Sam, being the adventurous type, would be excited to introduce the baby to the Autobot world. Mikaela, on the other hand, would be more focused on the day - to - day care. They'd probably have to make a special nursery that could also double as a safe haven from Decepticon attacks.
Sirius would probably be overjoyed at first. Harry is his godson and he cares deeply for him.
Sirius would probably be very worried and immediately try to help Harry. He might use some basic healing spells he knows.