Git is a Biblical angel.
The reason Git hardly reveals anything about his physical appearance is because he's secretly an angel of God and revealing his true form would cause people to lose their sanity. Even in his (fake) face reveal video, he keeps almost everything about his physical appearance obscured aside from his arms. In The Bible, angels typically only show a bit of themselves to humans because else humans would Go Mad from the Revelation upon seeing their true forms. In other words, Git is doing us a favor by not revealing his physical appearance. We are all Lub Lub.
We know that Lub Lub is all powerful. We know that he has the power to transform into anything, or do anything. (Except for summon a PS3.) So, with this knowledge, how do we know that Lub Lub didn’t create the universe, split himself up into biological life, and still have enough of himself left to retain stickman form? In fact, everything could be Lub Lub, including the PS3, because he is only unable to summon a PS3, not make one.
