Tyberos the Red Wake
Tyberos, also known as "The Red Wake", and "Lord Reaper of the Void", is the Chapter Master of the Space Sharks. He's known for having a pair of LIGHTNING CLAW CHAINFISTS, and Ripping and Tearing the living fuck out of anything and everything in assault with said LIGHTNING CLAW CHAINFISTS. As for character history he showed up out of nowhere like the rest of his chapter during the Badab War, where he spearheaded most of the chapter's assaults with a squad of lightning claw terminators.
He was never seen outside of his terminator armor and is described as never having spoken above a sinister whisper. Underneath the armor he's one ugly son of a bitch, with pure white skin, all black eyes, and half the bones in his face exposed (not specifically said, but probably looking like some kind of badass man-shark).
The Carcharodon's novels place him as Chapter Master, which is matched by his rules screaming Chapter Master louder than a heretic getting one of his LIGHTNING CLAW CHAINFISTS shoved up their ass. The 8th Edition rules for him give him the CHAPTER MASTER keyword, pretty much settling the issue.
Unlike most terminators, he doesn't have Crux Terminatus over his left shoulder.
On the Table
On the table he's a fucking monster once he gets rolling. He's got a chapter master statline with Carcharodons chapter tactics (Fear and Rage after he forces an enemy unit to fall back out of assault) Terminator armor and a teleporter homer. He can alternate attacks between his chainfists and lightning claws rather than having to make them all with one, and can take a single Lightning Claw terminator unit as a troop choice. His aptly named "Scent of Blood" special rule causes all other Carcharodons that get Rage from their chapter tactics to also get +1S for the rest of the game, but only after he himself does. He must be the Warlord and has his own trait that gives him and his unit Preferred Enemy(Infantry). In case it wasn't obvious he's a walking meat grinder. Taking him in a unit of LC Terminators with Preferred Enemy(Infantry) will guarantee he gets the ball rolling, unlocking the +1S for the rest of the army. His unit will become the most dangerous thing on the table(in melee anyway), as the Terminators become S5 with 5 attacks on the charge, re-rolling 1s to hit against infantry, and re-rolling all to wounds, while he gets 7 attacks on the charge that can be split between his lightning claw and chainfist profiles. With Fear. Holy shit. As if that wasn't enough he gets an Orbital Bombardment and the option for honor guard. His only drawback is that he doesn't have an Iron Halo, meaning he's only got a 5++. He's still a fucking badass man-shark though, which renders any and all arguments against him pointless (you'll need that what your opponent ragequits after he murders their ENTIRE FUCKING ARMY!!)
Now officially a CHAPTER MASTER thanks to the magic of keywords, and he's finally got that 2+/4++ he always wanted as a graduation present. Has a lovely 5 Attacks at WS2+ with Hunger & Slake, (crunch-wise a +1 Damage chainfist and +1 Damage -1 AP lightning claw respectively). Everyone can freely spread attacks between weapons now, so he's not special in that regard any more. His 8E special rules grant rerolls on all missed attacks and +1S for all CARCHARODONS within 6", including himself. His Strength bonus no longer needs to be activated, but it's now only a 6" bubble so you want to build yourself a melee deathball that teleports in 9" from the enemy and proceeds to LIGHTNING CLAW CHAINFIST a trail of severed limbs and eviscerated bodies through their army. No longer hands out extra attacks either, but you've got rerolls on all misses instead so that balances it out a bit.