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At first, I had no idea how to level him up; I just threw in some random stuff, based on the picture, and then he accidentally got buff. But in my opinion, he wouldn't have become a huge guy in a couple of months; he might have gained some muscle, but not drastically. And I also increased his height a bit, probably.
If anything, I'm waiting for Mental.
And yes, I couldn't watch the video; I'm using a work computer.