To me its just Team Ico.
but other than that, Jak and Daxter, Syphon Filter , Wipeout .......ect , also the fact that they constantly create new IPs.
Sony makes a lot of new IPs hence why they have their characters all over the place (which is to me is very dumb) , they don't have a defining mascot they didn't make a jak and daxter game on PS3 yet which is also amazingly dumb.
new IPs are great but ignoring your older IPs is a huge BS.