Stormguard Stalker

The Stormguard Stalker (also referred to as "Oni Stalker") is one of the enemies encountered in Tomb Raider. He is assumed to be the leader of Himiko's Stormguard after the Stormguard General committed Seppuku, who still protects the queen even though she is trapped in a decaying body.

First Appearance
He first appears when Lara Croft is attempting to rescue the co-pilot of the crashed rescue plane. When Lara arrives, the Solarii have taken the pilot hostage over the bridge. She is overpowered by them and is knocked out, but as her vision dims she glimpses men running past her, slaughtering the Solarii, and the Stormguard Stalker appears with his allies.

Second Appearance
Lara awakens in the larder, surrounded by corpses and captured yet again. She manages to escape through a hole in the wall, looking back as the Stalker is walking into the room. Lara continues into a chamber, where she is attacked by the Solarii. After killing them, Lara looks to see a Solarii man peering over the edge to ask why he's been hearing gunshots. He is ambushed by the Stalker, who doesn't notice Lara.

Third Appearance
His next appearance would be when Lara sneaks into the chasm, to rescue Sam. He would be getting ready for battle, with the oni helping put on his armor. He would catch Lara when she has just snuck out and send guards to attack. After a massive battle against the stormguards, she will come to face the stalker, however the wind blowing wooden fences will knock him out of the way for Lara to continue.

Fourth and Final Appearance
When Lara nearly reaches Sam, the Stalker appears to stop her. Lara and the Stormguard Stalker battle, and Lara realizes that the Stalker is armoured everywhere but his back. After fighting off waves of Stormguards and crippling the Stalker, Lara smashes his helmet and delivers the killing blow with her climbing axe. The Stalker dies, rendering the Stormguard leaderless.

Possible Origin
It is important to note that one of Square Enix's other games, Mini Ninjas, had an enemy that bared the same resemblance, build and weapon. They first appear at the Earth Temple, but make a stack of appearances throughout the game