Marneus Calgar
Marneus Augustus Calgar (also known as The Notorious M.A.C, The MAC Daddy, Manliest Cattleguard, Pimp Daddy Calgar, and Papa Smurf) is a character from the fictional Warhammer 40k universe. According to Matt Ward, 5th edition codex writer, Calgar is the spiritual liege of every Space Marine ever. All the Space Marines look up to him and strive ever jovially to be more like him and his Ultramarines, but because of their laughable shortcomings, most Chapters, including the Dark Angels, White Scars, Imperial Fists, Blood Angels, Iron Hands, Salamanders, Raven Guard, Space Wolves and all their successors, will never be as good. It is stressed constantly in the vanilla Space Marine codex and even mentioned a bit in the Blood Angels codex. The entirety of the Imperium awaits the day the Emperor awakes so that the Emperor may proclaim Calgar the rightful heir to the Imperial throne. As a surely irrelevant side note, Matt Ward plays Ultramarines (then later Necrons).
Marneus Calgar is the current Chapter Master of the Ultramarines Chapter of Space Marines, and titled Lord Macragge. Following a skirmish against the Tyranid Hive Fleet Perseus in 976.M41, Calgar lost all four limbs as well as large areas of body tissue and his left eye. Now fitted with bionic replacements, he is more machine than man twisted and evil. Several fa/tg/uys have argued that he currently bears a prosthetic robotic penis .
Calgar is one of the big three, the others being Dante and Logan, the three Chapter Masters the whole Imperium knows. While Dante is worshipped as a larger than life legend and Logan is beloved for being a bro to the common man, Calgar is respected for his leadership, both in battle and ruling Ultramar.
His characteristic weapons are the Gauntlets of Ultramar, which were reclaimed by the Primarch Roboute Guilliman from a Chaos Champion (Where'd he lose them in the first place?). These gauntlets allow Calgar to bash gaping holes in enemy lines, allowing his men to achieve victory for the Imperium in a joyous slaughter of the heretic forces across the galaxy. They do, however, make it extremely difficult to use restroom facilities, turn door handles, or hold small objects. They also have attached Storm Bolters on each arm. Like a baws.
An unofficial nickname for Marneus is "Papa Smurf", due to other players referring to the Ultramarines as Smurfs and Calgar being their leader. The nickname has its origin in the actual miniatures' diminutive size and the fact that they are blue. One could also point out of course that the average cartoon smurf is either a total dick or pants-on-head-retarded, and requires Papa Smurf's constant leadership and guidance just to function on an everyday basis. This allows us to extend the metaphor in a hilarious way. Further extending the metaphor is that he once got his shit kicked in by the Swarmlord, who has since been nicknamed Gargamel.
As of 6th edition he is also a xenos-loving bastard, having allowed the Tau to evacuate a planet that was facing Exterminatus due to a Tyranid infestation. To be fair, though, the Tau are one of two races (the other being Eldar) who work with the Imperials at points, so this could be just a bargaining chip to be used later. He also dual-wielded Necron Pylons while the Ultramarines were retaking Damnos (before you ask, Phil Kelly wrote this, surprisingly).