Is this character a member of the Wayne family?
No
Wear a costume, does this character?
Yes
Has this character ever met Barbara Gordon?
No
Did this character make any appearances post - Crisis, but prior to Zero Hour?
If the character did, it wasn't by much as far as I know.
Summary
Not a Superhero
Normally featured in comics starring either Superman or Batman, but not Superman.
Not female
Doesn't belong to a team
Villainish
Would not break through a brick wall by punching it on a normal day in Metropolis.
Not Batmite
Not a supporting character as things turned out
Has some scientific aptitude, even though it's not obvious.
From Earth
Appeared pre crisis but post 1970
Uses a codename
Is not a Robin
Is human
Has brown hair
does not have a hunchback
doesn't work in government (including military, police force, etc.)
Isn't a martial artist
Does wear a costume
Hasn't met Barbara Gordon
If appearances were made post crisis it wasn't by much.
doesn't have super powers
Isn't a martial artist
Didn't initially appear heroic or non-villainous, before being revealed as a villain
Hasn't been an inmate in Arkham
Hasn't vistied the Batcave
Isn't a member of BATO
Isn't more associated with Superman rather than Batman
Hasn't acted as a henchman / assistant to a super villain
Wasn't created by Denny O'Neal
Isn't a member of the Wayne family