I suspect the Snarly One would be undemonstrative, but would besides
protecting the child, take a great deal of interest in preparing baby
for life. In fact, that would be one reason he wouldn't be very
affectionate-- he sees the world as cold and wants junior to be ready
for the feelings of rejection etc that come in life. (Never mind that a
sense of unconditional love is more likely to work as a buffer. A
psychologist Avon isn't.)
He would however, teach the kid life skills-- computers and such, of
course, but even younger, he might play hide and seek with junior on the
grounds that "The child needs to know how to hide on board ship the next
time we are assaulted."
In short, um, he'd be a lot like my dad.
This is probably why I don't plan to have kids. I take after my father.