Well, it's almost that time...and I find myself wondering....what should Shredder look like in FF? Obviously he's got claws, and I'm thinking that Combat Skill: Master works pretty well for him. What else? Just for reference, I'm planning on having my Shredder be dangerous like his comic counterpart, rather than inept like his 'Toon version.
There's an attribute, spikey I think, that injures characters that get near - you could use that to simulate all the spikes he wears. Also armored would probably be good. Other than that I think it would just be any weapons (throwing stars, swords, tech, etc) you want to give him. Normal strength, good speed, agility and endurance.
Unless you're going the Super Shredder or Utrom route, then you would give him super strength.