Mandalorians believe strongly in the idea of the clan. With his family in Clan Kelborn so far distant, his clan is Clan Arcona - even if those of the Arcona-loyal Mandalorian Clan Erinos spurn him for not becoming one of their own. He will fight and die for those of Arcona, without hesitation. Arcona is more important to him than the greater Brotherhood is, for they took him in, showed him the true majesty of the Force and honed him into the weapon he is now. This belief is far greater than that of the needs of the rest of the Brotherhood, the Inquisition, the Grand Master's Royal Guard - truly, to his last breath, he is a champion of Arcona, even in a time of turmoil and twisted betrayal.

Mateus, to his absolute core, is Mandalorian at heart. He is a firm believer in the six tenets of the Mandalorian code, a trueborn warrior and a man of unshakeable belief in his upbringing. To question Mateus' heritage is to question everything that he is and is the fastest way to make yourself an enemy. He is here to enhance his prowess with powers and abilities to make him better able to defend his Clan back home and also to make him a better warrior - such being the case, forcing him to choose between something that betrays the Mandalorian code and loyalty to anything of the Brotherhood will see the Brotherhood lose every single time, from Battleteam leaders to Grand Masters.

Mateus has no time in his life for lying or deception, for liars or for sugarcoating his words. You will often hear harsh but true words from his mouth, but you can rely on him to give it to you as straight as he can possibly spin it. Lying will immediately cast a black mark upon you, but speaking truth in a difficult situation is truly the mark of the great in his eyes. Despite this, Mateus does his best to be as stoic as possible, keeping in his opinions - unless you tarnish his name and honour, at which point you may find yourself on the receiving end of a vicious verbal and physical tirade.

Mateus gives two hundred percent to everything he does, no matter what it is. This leads him down two paths simultaneously: first, it makes him an absolute workaholic to what he is taken with at any given time, pursuing it with utter dedication and tenacity even if it kills him. Secondly, it means that once that he finds something - and often he will find something new to give himself to - he will drop the old thing to give all of his energy to this new interest. This means that, with few exceptions, he has finished with and left behind so many things... or people... in his past.

Mateus uses many of the basic striking precepts of the Shii-cho Form, whilst combining it with the technical perfection of Soresu. This results in fast, straight-forward bladework with an aggressive precision, landing strikes both close to and far away from the body using a pliable grip. While this allows Mateus the ability to deflect blaster bolts either with single or dual sabers, it does not afford him the patient bastion of defence that Soresu is, forcing him to remain eternally on the offensive.

Mateus is one to seek the glory of battle from the very forefront, surging with power as the eye of the storm. His best abilities enable him to harm as many foes as he can using either Lightning or scythe them down with lightsaber blows bolstered by Rage or Amplification. However, this gives way to a rather severe deficiency in staying power - his body may be able to hold up for some time, but his Force reserves certainly cannot, leaving him drained extremely quickly if he pushes to excess, which is a frequent flaw when the bloodlust flows.