Isn't it? ^_^ I think they'd be cute together, especially since they seem to like the same people yet display character traits of those exact same people (for instance, how Road is also super-attached to her family/friends, just like Rinari).
Road is a Noah and therefore human. They're not dead, they're just humans with special powers - like an Exorcist, I guess, except on a different side. Akuma are mechanical beings with a dead human soul, which means that the only human aspect of them is that which has already died. It's not really possible to "kill" an akuma, then - but a Noah is a living human. (Tiki himself said that they were human and therefore not immortal.)