Batman's "gentleman's gentleman" is Alfred, or more fully - Alfred Thaddeus Crane Pennyworth.
I say "gentleman's gentleman" because he was always more than just a butler... he was a valet, confidant and advisor.
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Robin, although there are multiple Robins.
Dick Grayson- Who later becomes Nightwing, and then becomes Batman (in the comics).
Jason Todd-?Becomes evil.
Tim Drake-?Becomes Red Robin later
Damian Wayne-Son of Batman, and partner of Grayson.
Batman? Friend? I suppose you could say he's "friends" with the Justice League.
Also there's Alfred, and all of the Bat's partners like Robin. Catwoman is a special type of friend, but I don't see how you can fall in love with your enemy. </3