I don't think Aurelius(aka Credence Barebone) is suitable for Hufflepuff,or atleast hufflepuff traits aren't his leading traits. Yes he's hardworking and an outcast which hufflepuff parades itself,on taking in outcasts and freaks of nature,but like...that's about it. He's not loyal,given how easily he left nagini when faced with the promise from Grindelwald that he's going to finały reveal to him who he is,and neither is he kind hearted,because he's not,he's just extremely vulnerable,and he isn't patient,because we see him overcome with fury easily and the fact how easily he snapped at Queenie. We don't see him displaying traits of fair playness either. I think Aurelius,at his very core(because mind you,he's extremely traumatised,and his trauma dictates his personality) is a Slytherin,or a Slytherpuff. Because Aurelius is ambitious,and his ambition is set on one thing— finding out who he is,or his place in society. We see it the way he takes Grindelwald sides when the dark wizard promises him what he yearns after,as aforementioned before. He's also greatly resourceful,he quickly learns to adapt with the abuse he suffers,and the fact he managed to master his obscurus in five years(which is a trait practically unheard of— Aurelius is the ONLY mentioned obscurial to pledge full control over one's obscurus.) He's also self preserved with how long he managed to hide the fact he's the new york's obscurial for so long(I assume it's max. 20 years of hiding,he was still at the new salems when he was 26.) We can also see just how determined Credence is in his family's history.
And also I just love Nadence(given Nagini fits hufflepuff more) and I'd love to see more slytherpuff couples!Hufflepuff is so underrated and I love it,so who ever though it was an anti hufflepuff post,keep looking,because it isn't.