Unless Fred and George were watching Ron sleep on the map (which would be creepy), they wouldn't have noticed Pettigrew. It's only possible to see a human changed in his animagus form if you know the person is one. Therefore: Remus saw Peter on the map, he also saw Sirius. Harry DIDN'T see either.
Where did the Weasley twins get the Marauders map?
Fred and George Weasley stole the map from Filch's office in their first year at Hogwarts. They had been taken to his office for letting off a Dungbomb and saw a drawer marked "Confiscated and Highly Dangerous". George dropped another Dungbomb, while Fred stole the map from the drawer.
If the Map is activated by one of them, it shows their names, if it's activated by anyone else it does not. This was done to protect themselves in case someone, like a teacher, found out how to use the map. There is never any evidence in the books of anyone who isn't a Marauder seeing any of the Marauders on the Map.
Why Fred and George Weasley Never Saw Peter Pettigrew on The Marauder's Map ? (Harry Potter Theory)
Did Pettigrew regret betraying the Potters?
Though he valued his own life more than the lives of his friends, Pettigrew felt guilt for betraying Lily and James, but didn't have the courage to admit his treachery or to turn against Voldemort.
Lupin didn't know Peter had survived. He was like everyone sure that Sirius had obliterated Peter in their duel. He only recognized Peter when Sirius insisted that Peter was the one who killed all those muggles, then he cut of his finger and ran of. “All that was left from him was one finger”.
Newt believed that magical creatures were not dangerous if treated with respect, and Buckbeak only attacked Malfoy when he disrespected him. Due to this, Newt would have gladly traveled to Hogwarts to defend Buckbeak and try to prevent his execution, causing him to appear on the Marauder's Map.
Werewolves might be dangerous to humans, but they don't attack other animals; so Lupin's friends found a way to stay together as a kind of pack. James's Animagus form was that of a stag, which earned him his nickname, Prongs.
Until the climax of Prisoner of Azkaban, Lupin believed Sirius Black was guilty of murdering 12 Muggles, betraying Lily and James Potter, and killing Peter Pettigrew. He eventually discovered the truth — that Sirius was innocent, and the very much alive Peter was the traitor.
When the map is unfolded, you can glimpse the name Newt Scamander. That's right, the Fantastic Beasts protagonist himself was on the Hogwarts grounds during Harry Potter: The Prisoner of Azkaban.
Filch confiscated it from the Marauders at some point during their seventh year at Hogwarts. He had no idea what the parchment he had confiscated contained, but he did suspect that it was a questionable object. Hence why it was filed in a drawer marked “Confiscated and Highly Dangerous” in his office.
"Prongs" refers to James Potter's Animagus form, a stag. Interestingly, it is the same shape as Harry's fully-formed Patronus. This is why Lupin was so shaken after the Quidditch match with Ravenclaw in a previous chapter, recognizing it as James' Animagus shape.
How come Fred and George never noticed Peter Pettigrew?
This was a plothole by JK Rowling, we assume. However, (I saw this in a theory) it is possible that the Marauders designed the map so that no-one else, besides the Marauders, could see the Marauders on the map. That would explain why Fred and George didn't see Pettigrew.
Severus didn't recognise Marauders map, because he didn't know it was map in the first place. But he did understand that Lupin was one of the creators.
How was Harry able to see Peter Pettigrew on the map?
Harry could see Peter Pettigrew because Peter Pettigrew was at Hogwarts in his Animagus form, Scabbers the rat. The Marauder's Map cannot be deceived by magic, it shows who the person is despite potions, spells, ect.
J. K. Rowling has stated that she would fancy an otter — her favourite animal — as her Animagus form, though if she actually transformed, she suspects she might be "a guinea pig or something, which would be quite embarrassing."
McGonagall is a registered Animagus and can transform herself into a tabby cat at will. McGonagall was always held in high respect by her peers and students at Hogwarts and commanded a position second only to Dumbledore.
James and Lily were both Aurors, a very prestigious job, and were probably paid well. Because they were in the middle of the First Wizarding War, they probably took out some form of magical life insurance once Harry was born.
Examining Newt Scamander's social interactions, sensory sensitivities, and special interests and routines offers valuable insights into his character. While some argue that these traits align with autism, it is important to note that the character's creators have not explicitly confirmed his autism spectrum diagnosis.
In one scene, Aragog, the Acromantula tells Harry that he came to Hagrid "from a distant land, in the pockets of a traveler." This means that Scamander and Hagrid knew each other after the former traveled around the world to study, collect and learn everything about fantastic beasts.
Rolf followed his grandfather's footsteps and became a magizoologist himself, eventually falling in love with Luna. This makes Luna Lovegood the great-daughter-in-law of both Newt and Tina Scamander, further cementing another prestige family lineage in the Harry Potter canon.
His entire demeanor throughout the series suggest that Dumbledore was asexual for the rest of his long life. He died a 115 year old virgin. Lupin- Due to him being a werewolf, it's very likely he didn't lose his virginity until he met Tonks.
Scabbers was actually, as we know, Peter Pettigrew, an unregistered animagus hiding out as the Weasley's pet rat. No matter how hard he focussed his intention on turning the rat yellow, or even if he'd said the words rattus colovaria (erm, we did our best) the spell would never have worked because the rat wasn't a rat.
Scabbers is Ron's rat, but later in the book it is revealed that he is really the wizard Peter Pettigrew who has taken a rat form. The Weasley family adopted Scabbers (the rat) thirteen years ago; he used to belong to Percy but was passed down to Ron when Percy got an owl.
