None of the muddled characterizations go very deep, but the elite paramilitary heroes here show a code of always trying to save lives of victims (the uninfected, anyway) and comrades, no matter what. The Resident Evil universe continues the theme that big business is a breeding ground for powerful villains, boundless malice, and inhumanity. Characters seem multi-ethnic, with the qualifier that this is Japanese computer-animated; many have the Asian-but-not-quite-Asian facial features seen in "anime" cartoons.
Frequent carnage inflicted on humans and humans-turned zombies, including close-range gunshots to the head and limbs, being blown up, and set on fire. Blood spatters as humans are bitten by zombies. One character metamorphosizes into a grotesque monster, who is repeatedly shot, knifed, smashed, incinerated, etc. A piece of glass pierces a character's leg. An airline crash and a few humongous explosions.
Use of "s--t"and "a--hole."
There's a certain popular video game (and live-action movie series) this ties into, complete with a guide to the new game iteration on the DVD.