Aquaman figure!
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Superman Mego figure
OR
Super Friends Colorforms
both released in 1974
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I had a Super Powers Superman and Lex Luthor figure as a kid.
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The imaginext Batman figures and Play sets
The Batcave picture above I believe was my first, but I had a ton of those figures Batman, Robin, Catwoman, Clayface, joker, mr. freeze, bane, and those are just the ones I remember, also I remember one Play set came with a Batman with a removal mask which I thought was genius at the time,
It was basically my equivalent to that Batman 89 toy with the removable costume.
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The Mego action figure of Batman way back in the early Seventies.
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Mine was either a Superman or Batman figure. I can’t remember which one I got first, but I liked them both. 
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Wow that’s a million dollar question! I have no idea, probably the Super Power of Superman, Batman & Joker. I did have the Batgirl doll from the same company that made The Incredible Hulk doll which I also have. 
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He is no longer with me anymore
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Hmmmmm… I joined the fandom when I was 13, so I guess my first “toy” was a small build-your-own Lego Batman figurine made up of tiny Legos. I still have it, but his left arm fell off a few years ago and I haven’t been able to find it since. I do have a few POPS though.
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Either Mego™ Batman and Superman or Corgi™ Batmobile and Batboat.
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the flash justice league first dc funko pop
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I had this set of cardboard Justice League or maybe Super Friends figures that you colored yourself and then you could put them in a little plastic stand and display them. Each cutout had its own stand.
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Not sure what I actually had first, but I remember my Superfriends lunchbox
And my Mego Batman and Robin with the Batmobile.
Really wish I had kept my toys over the years. Then again, I might need another house to keep them in, but would that be so bad?
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That lunchbox + thermos is so especially, heartwarmingly classic. Love it!
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Super Powers. My sister bought me a bunch when I was 6 or 7. When I started collecting figures as an adult, they were the first thing I started hunting down.
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I didn’t get the lunchbox until first grade, that was 1976. I saw one at a convention a couple of decades later and thought, “gosh that’s small.”
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I always wanted the Mego Batmobile, but I never did get it! I did have the Batcycle though. I wish I still had the figures and the cycle.
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Oh, if one could clap their hands and have every such toy back in its original condition…
Those batmobiles were da bomb.
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That one I think I might still have somewhere… I know where Batman is…
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