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It's slime, not blood, hence green. If there are slime splats they may as well stick to the walls.

Since the Chex weapons are supposed to teleport the enemies back to their own dimension, it shouldn't even leave decals at all. Or the teleportation is more violent than advertised if it leaves little bits of the target behind...

It should... Or you could replace the sprites themselves.

In that case, Would it work if I modify the blood actors and gave them translations?

The default blood color is only used as color for blood decals. The reason this is settable in MAPINFO is that Chex Quest requires green blood decals, not red ones. This will intentionally never colorize the blood sprite.

AFAIK The sprites themselves are never modified unless a BloodColor is specifically given. For instanace, you could manually recolor them blue and they would all be blue in-game.

So it's possible that this only affects particles and decals, and the user is expected to provide properly colored sprites.

I don't know if this is a bug or the way it should be but changing the default blood color using gameinfo doesn't have any effect at all on blood sprites, it only changes decals color. Changing blood particles color, on the other hand, works just fine.