Can we suggest other finishers besides just spearton and swordswrath? I bet there's lots of ideas floating out there, here's mine (assuming all giants are max size):
Winner-Loser
Spearton-Swordswrath: The swordswrath attempts to stab the spearton, only for the spearton to bash his sword off. As the sword flies in the air, the spearton bashes the swordswrath to the ground and lets the swordswrath get beheaded by his own flying sword.
EGiant-EGiant: The winner pulls a boulder out of the basket behind him and uses it like a bowling ball to knock the other EGiant over (the boulder continues on into the enemies base hurting no one, but if you camera happens to be where it exits, you hear it smashing over stuff with funny sound effects), then pulls out another boulder to smash his skull in.
Shinobi-Meric: The Shinobi uses his pole to knock the Meric's weapon out of his hand, jabs at his feet to knock him down, and then cuts his head off with the pole and staff.
Miner-Swordswrath: The miner knocks the swordswrath onto the ground with his pickaxe, then swings his bag over and crushes the swordswrath with the bag's weight.
Swordswrath-Archidon: The swordswrath slices the archidon's bow in half, picks up both ends while dropping his sword, and strangles the archidon as he's trying to run away using the bow string hitman style, where he then picks up his sword again.
Magikill-Giant or EGiant (through poison): The magikill casts another poison spell, but it turns the giant ridiculously tiny, where he then blasts the giant into oblivion with a fireball. If the giant is at point blank range, the magikill simply crushes him with his staff like a bug (in a humorous way).
Meric-Giant: The meric heals the soldier the giant is carrying to undeadness, where the undead soldier then jumps onto the giant's head and dissolves into acid, melting the giant with him.
Shinobi-EGiant: The shinobi uses his pole to expertly climb up the giant as he struggles to knock him off. The shinobi then cuts off the straps of the basket with a swipe of his staff, and leaps off the EGiant's head, causing him to fall and crush his body on the boulders.
Swordswrath-Miner: The swordswrath slams his foot on the miner's foot, and pins his head to the ground with his sword when he bends over from the pain.
Funny Finishers (low chance):
Miner-EGiant: The miner drops his bag, dramatically transforms into a monstrous demon as big as the EGiant, and melts the EGiant to death with a massive inferno. He then transforms back into a miner, picks up his bag, and acts like nothing ever happened.
Archidon-Swordswrath (point blank): The swordswrath pulls off an impressive string of sword swings to show off, and when he finishes, the archidon pulls out a pistol, shoots him, and puts his pistol away to continue sniping with his bow.
Spearton-Swordswrath: The Spearton yells dramatically, "THIS, IS, ORDEEEEEEEEER!" A pit opens up behind the swordswrath, and the spearton kicks him in.