I am not certain, but try going to options, then display(or graphics, or whatever) or go to options, then gameplay. If it is possible, those should be where the option will be.
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No, you can't turn off the blood in Tomb Raider.
No. If you turn off the blood in Dead Island, Then you will loose a life.
Yes, you can turn off blood in dungeon fighter in the options menu.
No there is no way to turn off blood and gore or language in this game
In halo combat evolved you can go to settings and turn decals off and there will be no blood (except blood from the convenant which is blue and purple)