Well, the Gryffindor students might be excited. They would see Harry's new Netero - like attitude as a sign of even greater leadership and courage. They might follow his lead more eagerly in any tasks or battles. The Slytherins, though, would be more likely to view it as a threat. They would try to find ways to undermine Harry's new - found confidence. As for the Hufflepuffs and Ravenclaws, the Hufflepuffs might be a bit more cautious in their approach to Harry's change, while the Ravenclaws would be interested in the intellectual aspects of Harry's new behaviors. They would want to understand the reasoning and strategy behind it.
They would probably be very shocked. Hermione might be disapproving at first, thinking it's a strange Muggle influence. Ron would likely make a joke about it, like 'You look like a wizard Sith, Harry!'. Dumbledore, on the other hand, would be more intrigued and see it as Harry exploring different identities, perhaps even relating it to Harry's journey of self - discovery.
The Weasley family would have a range of reactions. Mrs. Weasley would probably be very maternal towards Harry, seeing Lily in his face. Ginny might be a bit shy around Harry at first, seeing him in a new light. Fred and George would likely use it for some good - natured teasing, like creating potions that make Harry's hair grow really long to enhance the resemblance. And Snape, well, seeing Harry look like Lily would be a constant reminder of his unrequited love. He might be even more conflicted in his feelings towards Harry, part of him hating Harry for being James' son but also being drawn to him because of his likeness to Lily.
Dumbledore would likely see it as an interesting development. He would observe Harry closely to see how the mask affects him. He might also try to guide Harry in using the power of the mask for good. Snape would be his usual skeptical self. He'd think that Harry is getting involved in something he doesn't understand and would be secretly keeping an eye on him.
Hermione would probably be both amused and concerned. She might try to find a magical solution to get him out of this situation as quickly as possible while also having a bit of a chuckle at the absurdity of it all.
Hermione would probably be very confused at first. She'd try to understand the reasoning behind it and might be worried that Harry has lost his sense of self. Ron would likely make jokes about it, but also be a bit concerned. Dumbledore, on the other hand, would probably see it as another step in Harry's journey of self - discovery and would encourage him to explore what this new identity means. Voldemort might see it as a sign of weakness or a strange ploy by Harry, but would still be cautious as he doesn't fully understand the implications of this new name.
His character would become more complex. Harry would have a mix of the kindness and loyalty from his original self, but also Netero's no - nonsense attitude. He could be more calculating in his actions, thinking several steps ahead like Netero might in a battle.
Ron would be extremely angry at first. He might feel betrayed by Harry. But as he realizes that something must be seriously wrong with Harry, he would probably join Hermione in trying to save Harry from Voldemort's influence. They would look for a way to break whatever spell or false belief has hold of Harry.
Hermione would be very worried. She would likely try to convince Harry to come back, reasoning with him about the importance of family. Ron, on the other hand, might be a bit more understanding. He might give Harry some space at first but also keep an eye on him. Dumbledore, if he were still alive, would probably have a long - term view. He might let Harry go for a while, knowing that Harry needs to grow on his own, but also be ready to guide him back when the time is right.
Dumbledore would likely view it as another sign of Harry's individuality. He would see it as Harry growing up and making his own choices, as long as it doesn't interfere with his destiny. Snape might sneer at it, thinking it's just another Gryffindor folly. But secretly, he might respect Harry's courage to do something different.
The other characters' reactions would vary widely. Ginny would be heartbroken. She might feel that Harry has abandoned not just his identity but also their relationship. Neville would be shocked and would probably feel that Harry has let down the whole school. Some of the Slytherins might be secretly glad, thinking that it removes a threat to their own ambitions. However, many of the younger students who looked up to Harry would be confused and disappointed, as he was a symbol of hope for them. Teachers like McGonagall would try to keep the school together in the face of this chaos, while also hoping that Harry would return.