Improved search algorithm
Currently, the basic search algorithm on IGDB seems to value popularity over anything -- even the title of the game being searched.
When I searched for "Persona 2", it being a 2-part game, the games "Persona 2: Innocent Sin" and "Persona 2: Eternal Punishment" appear as the 16th and 19th entries down the list respectively, while "Persona 5", by dar the most popular game in the series, showed up first.
The algorithm needs to prioritize the search input much more than it currently does, as the current system renders inputting sequel or series entry numbers (2, 5 etc.) quite useless.