Answer:
There are four of these, but everyone's favorite seems to be spades.
Two year-old children who throw tantrums get this nickname. So did the tsar "Ivan."
Turns us on our backs, and open up our stomachs. You will be the wisest of men though at start a lummox.
Born in the past, but only lives in the present. Sometimes false, always personal.
I occur twice in eternity. And I'm always within sight.
People take me on walks and I run and have fun. What am I?