I've seen a couple of people do these, so I thought I'd make a better one than everyone else.
BrickBot2.0 lets me steal his pie, and only once did he try to kill me.
XForce Is a celestial ghost-like being (whatever that is?) who makes some cool custom minifigs.
Twiggy is on Ideas, (That kinda makes it sound like some kind of medication,) and makes really cool MOCs.
Nansbrick was one of the people who introduced me to Mecabricks, with his amazing MOCs.
ApocalypticBrick Also makes awesome MOCs, and cool minifigs of himself.
TG_Studios makes some really cool renders and custom minifigs.
TheCJbricker10 makes lots of insane MOCs, and cool videos about them too!
Lego_Lover makes also sorts of awesome custom stuff, and some really sick renders.
MOCmaster Makes some really cool Ninjago stuff, and other awesome stuff.
Sir Nerdz, is fairly new to Mecabricks, but is already really good at making some cool stuff.
TheCalcMan, Ace of Algebra, Lord of Logarithms, Conquer of Calculus, and has a really cool sig fig too!
and Kylo Ren, yes I actually know him, I met him on Ideas.
Commander Brick, I've known him on Ideas for a while, and he's recently joined Mecabricks, and makes some insane creations.
Ethan.J.Bricks, was nice enough to make me a grave, and is now officially one of my friends.
Jmanbricks, Is another guy I know from Ideas, but also has some really cool Mecabrick models too.
*New Addition!*
ArmoredBricks, is probably the greatest MOC builder I know!
I wish I could link all of you guys accounts, but that would take forever.