Cant be aquaman, he a loving but wrathful father/husband, also most people say he sucks cause they've never seen his full story, hes got armor strong skin super strength and dominates the ocean, when his child was threatened and was being restrained he cuts off his hand to free himself, now he sports a wicked looking spear head for a hand and sometimes a metal fist/gauntlet, hes extremely aggressive and somewhat of a tyrant as he is king of atlantis.
The robins, i doubt it, bruce formally adopts all of them and the last one is his biological son, the second robin becomes redhood and then red-robin i believe and is a merciless killer of criminals.
The first robin becomes nightwing and was almost married to starfire.
As for being the first gay dc universe character, thats false since there are already gay/lesbian and bisexual characters in dc universe such as bunker
and ofc batwoman