hi! I agree with you about Merlin being in Slytherin, and I don't think Merlin's selflessness would necessarily put him in another house. Slytherins can be selfless too, they just tend to apply it to the people they care most about, which I think fits Merlin fairly well, if that makes sense
yeah, definitely. They’re selective with their selflessness, which Merlin totally is
It’s actually a bit different than say, Hufflepuffs, who tend to be caring and selfless and apply it to people in general, hence why I think Gwen makes a good Hufflepuff. (though Merlin also cared about people dying during the plague in series 1 and tried to helped the Druid boy in series five, at a risk to himself, hence Hufflepuff traits as well)
I mean, there’s only four houses. I think any characteristics can be applied to any of the houses. Obviously, Harry, Ron and Hermione were cunning as well. So was Cedric Diggory to an extent.
And while I associate ambition with Slytherin, I think Ravenclaws can be very ambitious as well (just look at Gildoroy Lockhart).
Tbh, while the whole Hogwarts House system is fun, it’s so deeply flawed I’m not too worried about it. I think students should have at least been re-sorted a couple of times during their time at Hogwarts, but whatever.
ETA: Now that I think about it, Merlin might have the selflessness of Hufflepuff, but I think he has the loyalty of a Slytherin. Selective and unbreakable. Think of the Malfoys, of Snape.