The lack of emotion in the stare can be very creepy. If it's just a cold, dead stare, without any hint of humanity or kindness. It gives the impression that whatever is doing the staring is not alive in the normal sense, or that it has no empathy. This makes the person on the receiving end feel very vulnerable and scared.
Definitely. The comic version of Homelander is portrayed as having greater strength and capabilities. This is evident in his confrontations and the scale of his power displays throughout the comic series.