Lord Calgar

Marneus Augustus Calgar is a character in the Warhammer 40,000 universe, Chapter Master of the Ultramarines, Lord Protector of Greater Ultramar, and Lord of Macragge, the capital world of the Kingdom of Ultramar on the Eastern Fringe of the galaxy.

Biography
He did not come from a noble house; he was a servant of the House of Calgar and bore the name Tasithan.
He underwent secret procedures that transformed him into a powerful Primaris Space Marine, making him stronger than the average brother within the Chapter.
Following the resurrection of Roboute Guilliman, the Primarch appointed Calgar as Lord Protector of Greater Ultramar to lead the effort to liberate the realm from the forces of Chaos while Guilliman embarked on the Terran Crusade.

Weapon
The Gauntlets of Ultramar are twin power fists with attached bolters, allowing Calgar to both crush enemies in close combat and snipe them from afar.
An Iron Halo is a personal force field against ranged attacks and often warp forces.

Lord Calgar's character from the Warhammer 40,000 universe:
A natural-born leader, he is capable of leading into battle and inspiring his soldiers to great deeds. Calgar never abandons his troops without a clear plan.
A proud and noble man, his character has earned him many enemies within the Imperium. However, he has a well-developed sense of self-preservation that prevents him from crossing a line that would bring trouble not only to himself but to the entire Chapter.
Immune to fear and unwaveringly brave under fire, Calgar quickly assesses the situation, chooses the best course of action, and dives for cover only when there is no tactically viable alternative.