Don't be fooled by Aigis' beautiful face. This 'girl' is one part pretty and 9 parts killing machine. While her interactions with the SEES group and (the shockingly charismatic for a silent main) Minato in particular helped her to become more human, she is still quite capable of eliminating anyone who gets in her way. A machine is built for a purpose, and her's is to destroy.
Which translates pretty well into a dueling arena setting, huh? With a body made out of steel, Aigis is pretty resilient to attacks, especially piercing attacks. Couple that with a metric ton of full healing through her Persona and Aigis can keep on going and going like the Energizer Bunny (if the energizer bunny were a decked out killing machine). Or for a quicker and bloodier end to a match, she can activate her Orgia mode and take advantage of the damage doubling it grants her to crush the opposition in record time. Aigis is a foe to be feared... as long as the opponent doesn't have lightning damage. She doesn't much like that.