Lovejack is a word play on the Jack of Hearts, which as a playing card, is a "soldier" who represents innocence and emotion. It portrays a strong, romantic, and yet vulnerable character.
He's kind of a lovejack you know? Like, affectionate but sometimes he just needs to be alone.
A man with a mixture of dark and light charisma. Rock solid, his presence carries gravity. Not boyish, not overly manly, intense in all he does, examples include Jack Skellington, Kylo Ren, James Bond.
See that bartenderover there? No, the one with the serious face, he looks like a lovejack.