He is called O'Brian in the European release (Advance Wars: Dark Conflict) and ブラウン (Buraun Brown) in the unreleased Japanese version (Famicom Wars DS: Ushinawareta Hikari).
Brenner sacrificed himself to protect the Legion and the Sapphirus troops.
Brenner was a charitable man with a sense of honour.
Brenner's personality led to him getting on with Will and earning mutual respect from Forsythe. However, he didn't get on with Greyfield or Waylon, causing the Legion to enter a war with the New Rubinelle Army.
All units in the CO Zone receive a 20% defence boost. Radius: 3.
All units recover 3 HP.