Dr. D. Light is such a cute and good character. He actually tries to help Embry and you can see how he really cares about others and tries to make Embry happy.
Even in the nightmere, when he "became" a monster, he literally says: "They might be as not as forgiving as me...", which means he probably forgave Embry for "killing" him, which makes me think that his jumpscare is just for gameplay purposes.
In the end, Dr. D. Light is a hero who really tried to help Endry, but he died while trying to do so.
But, in the end, we already know it, good guys always die.