I think INFJs have a grand capacity for bromances. The nature of this type of relationship requires one-on-one friendship preferences... precisely the kind of thing that INFJs are willing to work on.
Incidentally, a friend of mine (who might very well be ISFJ) has stated that I have a "bromance" with my INFP friend. Indeed, I have at least two INFP friends who I would readily deem as bromantic, even though we don't usually hang out. The only other bromances I might have are ENTP, ISFJ and ESTJ.