White health: Normal. Can be healed by the likes of Mercy, Lucio, health packs, and more.
Blue Health: Shield. Passively regenerates after not being damaged. Found on Zarya, Zenyatta, and more.
Orange health: Armor. Offered by Torbjorn, found on Bastion.
Magic walls (blue or red, depending on team): Barriers. Blocks shots of enemies, allows allies to shoot through freely. Found on Reinhardt's arm toy, Winston's bubble, Bastion's turret, and more.
Now I have some questions. I'm told the types take different amounts of damge. Anyone got specifics on that?