Tavi is said to be distantly related to harry dresden. This is due to them having some kind of common ancestor or lineage. So it is likely the main character here would have a similar family link. The thing is both Tavi and harry wield great power, so it would make sense if if the main character had their own. But the thing is, there is only a limited number of people with such an ability but they are kind of broken.
I wonder, Grimm has such a bond/link to his ship, could that develop into power like folly has. Just like Tavi started with just his wits, this guy could be the same. He has an advantage, his ship could fill the holes that the power created.