Those are all Sony Mascot's at one time, but Crash Bandicoot was the best when he went to Nintendo calling them out

This.

Some people do associate Kratos and Nathan Drake with Playstation, but really they aren't so intrinsically connected to the brand that they're mascots. People see Mario or Sonic, and they think Nintendo and Sega.

None. No character has come even close to that position. Crash was close 20 years ago, but there's been nothing comparable since.

Knack is the true Sony Mascot.

Sony OWNS the Ratchet and Clank IP.  They have Insomniac handle it, but could pass it to another studio if they saw fit.

Helghast are the antagonist race of the Killzone IP, and have had a presence in the PS brand for a long time.

Sackboy has had a stong presence on all Sony platforms from the PS3 onward, though he has lost steam with LBP3.  He has been used often in promoting the PS4 overall though.

Just because you may not be privy to an aspect of Sony IPs does not mean that those options are null.  Most people know about them, regardless of your personal perception.

Alloy has been in one game  and cannot qualify as a mascot that represents generations of the Playstation brand.

PlayStation is mascot-fluid.

None, PS is diverse for a reason. Sony gives the devs creative freedom to move on from any ip or stick with it like with Uncharted and God of War.

I go for Ratchet & Clank as their mascots. I think that after Spider-Man, Insomniac should double down on a Ratchet & Clank game based on the Bogon galaxy and go even bigger with more arcs, introducing more characters like Ace Hardlight and Talwyn.

Both Drake and Sackboy have appeared on multiple consoles (at least 3) and have had 4 or five games at least each.  They have become iconic over the past decade as well as featured in much of the brand advertising, and this is the difference.

Alloy is great, but she was only in one game, on one console, little over a year ago.  We have no idea how the IP will develop and significant amount of time would be required before we can see if she would truly qualify.  All others on the list have had that significant amount of time to make their mark, and they have.

Having one good game does not qualify representation of the entire Playstation legacy.  I am sorry, but that is just how it is.

To those saying Spiderman, he has been multiplatform until this one game.  I cannot see him as a Playstation mascot either.

To those saying no one fits the bill, lighten up...that is low hanging fruit.  We are looking at who MOST fits the bill, not an end all be all of who the mascot is.