So, Riddick evolves a lot in the stories, so I'm not sure which one you want to go with... I like the one from the first movie the most, so trying to capture that more... I don't look at Riddick as being so great at straight up hand to hand. He's not bad at it, but he clearly finds himself more effective with short blades and throwing things.
The trick with a throwing adept is not so much to max out your agility as it is to max out your strength, and then throw in missile mastery & precision throwing for extra range & damage. The other trick is... use boomerangs (harpoon/javelin gives you some AP and extra DV, but loses all subtlety). With 10 Strength, you get a max range of 240. Forget farther than a heavy pistol --that's farther than a submachine gun and near long range limits for an assault rifle! In the SW world, I'd also give him a couple of flash bangs or similar grenades just for tight situations (grenades + throwing adept = max carnage).
Normally, I'd say go adrenaline boost instead of improved reflexes, to free up power points for things like improved ability and combat sense, but Riddick is clearly a fast reaction kind of guy as well, which adrenaline boost just isn't going to get you that. I'd still use agility boost instead of any other magical boosts to agility.
If you want to really capture the whole notion of him being a Fury and a bit unusual in that regard, I'd open up the SURGE possibilities a bit... maybe just to boost strength.
Give him Ceramic Knives, Sapphire Knives, a survival knife, etc. Basically symbolize that he kind of collects anything that works as a decent blade anywhere.
As long as he's going to be an adept, I'd also throw in a Raven mentor spirit. That imposes the right kind of personality traits, gives him that awesome traceless walk, and even the voice control power covers some of his attempts at mimicry (though with low charisma, not going to go well).
The tough part for me is the attributes. Yeah, Riddick should be really high in all physical attributes, but he should have decent intuition and willpower as well... and while it is tempting to give him low charisma, that plays out odd in game mechanics (seriously, how bad can his composure dice pool really be? ;-). It's kind of hard to be high in pretty much all attributes, even with aftermarket updates.
Of course there is the eyes... I'd argue he has low-light vision, not thermovision. The best way to emulate how his eyes work is with the Night Vision attribute, but from a fluff perspective, Cat's Eyes augmentation works better.
Other abilities that fit him one way or another... Barren's Rat, Catlike, Double Jointed, Will to LIve...
I went with more of an adept focused type, rather than an augmentation oriented type.
Attributes - A, Metatype Human Changeling - C, Resources - C, Magic (Adept) - D, Skills D
Surge 1 w/Metagenic Strength Improvement + Impaired Charisma + Nocturnal
Attributes:
Body: 5
Agility: 5[6]
Reaction: 4[7]
Strength: 7[10]
Willpower: 5
Logic: 2
Intuition: 4
Charisma: 1
Edge: 3
Magic: 6
Positive Qualities: Double Jointed, Mentor Spirit (Raven), Night Vision, Prototype Transhuman (Wanted)
Negative Qualities: Did You Just Call Me Dumb?, Ex-Con, Impassive, SINner (Criminal SIN)
Skills: Blades 6 (Knives +2), Con 1, Escape Artist 1 (Contortionism +2), Gymnastics 1, Impersonation 1, Intimidation 1, Palming 1, Perception 1 (Visual +2), Sneaking 1, Throwing Weapons 6[7] (Throwing Clubs/Boomerangs +2), Unarmed Combat 3(52 Blocks +2)
Magic: Attribute Boost 1 [Agility], Combat Sense 1, Improved Reflexes 3, Missile Mastery, Precision Throwing 3, Traceless Walk, Voice Control 1
Augmentations: Muscle Augmentation 3 (Used), Muscle Toner 1 (Alphaware), Reflex Recorder (Alphaware) Throwing Weapons
Weapons: Boomerang (lots), Ceramic Knife, Survival Knife, Throwing Knife
Armour: Lined Coat (2x Concealable Holster, Concealed Pockets)
Gear: MCT Blue Defender, 2 Meta Links, Goggles 4 (Flare Compensation, Vision Magnification, Vision Enhancement 2), Horizon BoomerEye, 2x Standard Credstick, Long Haul, Trodes
Social: Criminal SIN (duh) Street LIfestyle, Fake SIN 3 w/Squatter Lifestyle, Fake LIcenses 3 for Adept Magic, Muscle Augmentation, Muscle Toner, Throwing Knife
Contacts: Church Pastor (Connection 2, Loyalty 2)
That kind of build isn't totally killer in combat, though could be made more so with some obvious tweaks, but the main thing is he can get you quite badly without presenting much of a threat/advanced warning. Lots of obvious venues for additional development with more Karma.