Oropher’s born to Muggle parents, which is part of the reason he’s so fascinated by every subject and so eager to learn. It’s a completely new world to him and he finds it mindblowing that he is capable of all these wonderful things. His parents are super proud as well, tbh - after getting their heads around it.
Caranthir, a pure-blood Slytherin, is often asked by his peers why he’s befriended this weird little Hufflepuff, a question he answers with fond praise of Oropher (though not if the Hufflepuff in question is around). But if anyone dares to call him a ‘mudblood’ in Caranthir’s presence, well... they might just find themselves on the end of a nasty bat-bogey or horn tongue hex.