Of the last three, I'd say Static is most likely to win due to the fact that a LOT of people know who he is.
Red Hood is up there...but it was only one animated movie. Despite that, he has the gritty anti-hero appeal. But I think he's actually one of the lesser known bat-family members amongst the general public. More known than Batwing, Ace the Bat-Hound and Red Robin, but I think Static is taking the poll.
Static Shock was a Saturday Morning cartoon for the target demographic of this game (people ages 18-30) which was HUGE during the 90s in the US. The TV ruled people's lives back then and many kids/teens at the time for sure saw the exploits of Virgil Hawkins and can probably sing a portion of the opening song (At the least, SUPERHERO, STATIC SHOCK! WHOO WHOO!).
Zatanna has a classy female appearance, but despite showing up in Young Justice and JLU, I think aesthetics are what's getting her up there in the polls.
My guess would be:
Static
Red Hood
Zatanna
In that order of popularity. Though I think Zatanna or Red Hood could be swapped considering Zatanna was in first at some point.