Eöl from Tolkien's The Silmarillion
Someone recently was talking about how, because Eöl hangs out with the dwarves, he might have tattoos too. Eöl isn’t much of a follower though, so I think he’d be into scleral tattooing. Tolkien also talks about his unsettling/keen glance, so it got me thinking.
Bonus fact: Scleral tattooing can lead to unexplained light sensitivity, something that fits well with Eöl only wanting to be out at night.