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Mythical Beast… Apocalypse Bringer…
They were not just titles given to Drake through the game-like System he had.
After all, his System didn't simply generated new powers out of thin air for him, Titles were not just stat-boosting thingies he would get every now and then.
Each title was an actual real title, a thing that marked him amongst others all around the world.
The same way Skills were also Abilities that even other people could possess whenever he looked into their Status, even when they lacked a System, Titles would also be present in certain individuals, even though they didn't had any game-like power attached to them.
In a way, the System helped Drake develop these abilities where other people would find limits and walls. He seemed to have no boundaries in this aspect.
Check "The Protagnist's Sister Is Actually the Strongest"!