Davis (or Rubinelle) is a CO who appears several times throughout Advance Wars: Days of Ruin. He is first seen as a subordinate of Admiral Greyfield in the New Rubinelle Army who used to serve under Captain Brenner. It is believed that he was killed by The Creeper.
Davis was first a military cadet in the 12th Battalion; it is unknown whether he was separated during the meteor strikes or if he was transferred to another unit. However, he joined the NRA in their fight against the reformed Lazurian Army. A year after the meteors came, a search-and-rescue unit of the 12th Battalion encountered him with a heavily damaged force. After dispatching the attacking Lazurians, Brenner recognized him and inquired about his previous situation, which led to them joining Greyfield's fight against Lazuria. Brenner, Greyfield and Waylon immediately disagreed with each other on several topics, and Davis was used as a negotiator. Following the escape of the Lazurian forces and the 12th Battalion's mutiny, Davis was seen leading the initial attack on the small encampment. When Will defeated his forces, he disappeared for an amount of time, but was revealed to be one of the NRA troops heading to Salvation to be cured of The Creeper. After the defeat of The Fanatic, he was presumed to have died in the battle or from the virus, as he was known to be very near the deadly stage.
Davis is a fearful and unfortunate commander, often being thrust into situations against his will by his superiors. He lacks a CO power or ability, as well as his own theme; he uses that of The Beast.
Davis is used as a servant by Greyfield, and is often subjected to the latter's insults. Even so, he respects Greyfield and Waylon and follows them without question. He is believed to have had a good relationship with Captain Brenner.
Davis lacks special skills.