What about (and apologies in advance).
My appearance is about as varied as it could be
Everyone's poo looks different, and can be different all the time
Unless you unveil me, you won't see the real me
You know its there, but until you have 'unveiled' it, you cannot see what it looks like.
Without me, you life can become a pain after the act but by having one of me, happiness can be extended which can be a fact
Who hasn't felt happiness after doing a poo. Can be quite relieving sometimes. And if you don't do it, then yes you can be in pain.
My lifetime is short but your experience I shall support.
yep once you flush him, he is gone! And of course, your experiencing in getting it out, is wholly supported by said poo.