Quick update post regarding the most current edit.
This will be explained later but PlayStation IP’s have now been categorized mostly (I’m still unsure where to place Patapon and PaRappa given their weird situations). PaRappa has already been explained but Patapon is a new problem. Apparently SIEJ approached the artist of Patapon (apparently Patapon existed before it was a game) to make the game and InterLink Planning is also mentioned under Patapon in the PSBR credits.
I’ve also started to add the studios that are considered as part of SIE’s Worldwide Studios.