first looks just like a dempsey/jag cross my buddy used to have. Second and third look to be more dempsey than festae. I agree the manaconda pics look similar in body shape but the coloration and shape of the head on your pics look more dempsey to me.
The manaconda suggestion is interesting and they do look similar. With one exception the mouth and lip structure. To me it says Jack Dempsey all the way. BTW both fish are believed to be from the same parents.