Upon being rebuilt and reformatted from the ground up by the Apex Brigade leader and expert mechanic, Rhiann Baenre, the Magnaguard AB-2 manifested an aberrant personality. Initially mute and skittish around most agents, the droid occupied itself by committing bizarre thefts and other actions around the Brigade base, and was eventually discovered by Bolera. The Knight understood the droid's antics as odd but well meaning acts of kindness, which the droid described as "assistance" and "help", and Adam served as its first friend. The droid became so protective of Bolera that it followed him nearly everywhere, causing other agents to dub the droid Adam's "keeper". The name stuck upon their official partnership.
"Keeper" is atypical among droids in that it exhibits a remarkable capacity for empathy, capable of intuiting one's emotional state from only a small handful of criteria. It reads everyone it encounters, and often makes cryptic and unnerving statements to describe what it perceives. If given the opportunity, Keeper will attempt to subtly "assist" someone he thinks is in need. On a personal basis, Keeper is very polite, gentle, and complimentary when approached, even to complete strangers, but tends to avoid making its presence known. It has a childlike fascination with the world around it and the logical paradoxes presented to it, and Adam does his best to answer the droid's questions. It strongly dislikes causing pain or suffering of any kind in any creature.
Despite its peaceful personality, Keeper is not a pacifistic droid. Its desire to protect those it cares for outweighs its distaste for doing harm. It is quick to alert its partner to danger and defend both Adam and other Brigade agents with its life. Keeper has modified its weaponry and trained with Adam to utilize killing methods that are as efficient and painless as possible for multiple species.
Keeper prefers to look inconspicuous and blend with the natural environment if possible, and wears an olive drab and brown hooded cloak over its body. Its face is distinguished by the multiple lenses over one of its photo-receptors, which have been altered to glow a cyan blue from their original red and give the droid multiple vision types. The droid keeps its weapons hidden as well; concealed within either wrist are custom blasters and vibroblades, making it especially effective in impromptu skirmishes and assassinations. Keeper remains adept with an electrostaff, which is kept in halves on either hip, and also carries an old DC-15 rifle with which the droid was found.