During his rollout, Lifeweaver was accompanied by a short 2D animated trailer which explained that the Thai scientist was once a student at the Vishkar Academy who created a technology called Biolight.

Source: https://gamerant.com/overwatch-2-suravasa-map-easter-eggs-lifeweaver/

Outside a few characters that find themselves somewhere in the middle, like Symmetra due to her place in the shady Vishkar Corporation, most characters are either good or bad.

Source: https://gamerant.com/overwatch-2-mirror-universe-battle-pass-skin-ideas-moira-winston/