They're...different? The hierarchy is different, the way demons are born is varied, they're not bound by virtues and vices, they're more dangerous. [The demons here are dangerous, but people appear to be capable of dealing with them and most demons seem to be mindless.] Certain demons can disguise themselves as humans, most of them do it for gain, some of them do it because they choose to deny their heritage so they can live in peace.

[Few and far between, but it happens.

And at that Dante rounds the corner to the path leading to Fenris's manor, he's not difficult to spot if one is looking, like a tall, red beacon.]