Lenny has not always been the same as he is now. I created him waaay back in middle school, and he kept evolving more and more until he finally reached what he is now.
This is fine and dandy, as characters grow and change just like people. But part of me has always missed some of his old features and parts of his personality, as well as the characters he used to interact with (all of which I'm going to redesign and bring back as well).

So I recreated him. I took all the versions I've had of him from 2007 to 2012 and averaged them out with each other to create the new "Reboot" Lenny.

This "'Boot Lenny" is on the left. Alex, aka current Lenny, is still the more official Lenny, since I still like him more than 'Boot. He's also the only self-aware one. I was worried they'd look too alike (since they're the same person, haha), but luckily they're different enough to tell them apart. :3

ALSO I did, in fact, shrink Lenny's height down to 6'3" a little while back, but haven't updated it on his ref sheet yet. :I

EDIT JUNE 2014:
I never ended up doing anything with 'boot Lenny, haha. Also Alex is only 5'10".