By the way,
Gwath (or anybody), just a note - Hilderinc is not a totally "looks like all others" Eorling (you can read his description) - notably his hair is not blonde, but more like light brown, and it is not long, but shorter (whatever cultural implications long hair might have among the Rohirrim, his is just considerably shorter than usual), and his eyes are simply dark (I think, however, that might be common even among some of the fair-haired Rohirrim). He is also not so overtly tall, may be even shorter than Crabannan? (Probably if so, then not by much, but still?)
It is not that he would be
so strikingly different or anything (he is far from looking like a half-Dunlending or anything like that), and he is definitely an Eorling (he likely has some "typically Rohirric" features discerneable easily especially by an outsider), it just seems that the recessive genes have somehow lost the battle in his case
(Hmm... I may as well edit his bio with this somehow "advanced explanatory stuff".)
That's not to say, Crabannan still can percieve him like a "Rohir like all the others", as to the outsiders things can seem a lot different (to some Haradian, for example Hilderinc's hair would still seem incredibly fair), depends on what features they focus in, but anyway, this is just to say that "tall with long blonde hair" stereotype won't exactly work here.