As below states, Macragge is not an individual, it is the Space Marine Chapter known as the Ultramarines main recruiting world. It is highly fortified by fleet movements and has a prosperous success of recruitment. Macragge resides in the sector Ultramar, which is what the Ultramarines name sake comes from. Macragge is the where the Temple of Ultramar also resides where the Ultramarines primarch Roboutte Gulliman resides in statis after being horribly injured.
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Macragge is not a person. It is the homeworld of the Space Marine Chapter the Ultramarines.
Umm...it's yellow paint...It was probably used for highlights on the space marines models for certain wargear.
That box set has been discontinued, They do sell an assault on Black Reach set though that contains Orks (warboss, boyz, deffcoptas, and maybe nobz) and space marines (captain, tactical squad, dreadnaught, and terminators)
AnswerThe most popular 40k army without a doubt is the Space Marines. Apart from the fact that Games Workshop flog them to death, there is a certain allure to playing a race of 7-foot-tall super humans, that tempts everyone at least once or twice.