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Amaki Ren is the Sword Hero and one of the four holy heroes summoned in Melromarc.
Ren is a person who acts cool and tries very hard to portray a loner's image. He runs his party like a guild, only working with the other members when the prey he seeks to kill is too strong for him alone. His particular attitude to this is that weaker members should work to individually increase their powers to catch up to the stronger ones.
Like the other heroes, Naofumi excluded, he is initially under the impression that the world they've come into is a game, and he stubbornly refuses to think otherwise. Unlike Motoyasu and Itsuki, Ren also seems to actually recognize to some extent the consequences of his actions, as he understood it was his fault the Zombie Dragon caused a plague. He is also more reasonable than Itsuki or Motoyasu, as he believed in the possibility that Naofumi was telling the truth when he claimed that Princess Melty was under his protection and not his hostage, and gave a proposal to help resolve the situation peacefully. He, alongside Itsuki, also stood up for Naofumi after Malty and Motoyasu tried to take Raphtalia from him via cheating, and called Motoyasu out for believing Raphtalia was brainwashed even when they saw her comforting an obviously crying Naofumi.
While possessed by greed, Ren becomes a bandit leader and organises them to amass wealth, he also defeats people on the road and steals their stuff, but fortunately doesn't kill them. He becomes obsessed with increasing his power. After succombing to Gluttony this gets much worse, and he is willing to kill people to absorb EXP from them and grow stronger. His obsession with power is however either hollow or just an attempt to escape from reality, as when asked the reason for it he can only express the purpose given to him by others: saving the world. When he is finally defeated, he reverts to a broken, but otherwise normal, Ren.
After being freed from his curses, Ren decides to learn under Eclair and try to save the world his late comrades loved so much.
Ren has a black hair with pretty handsome face and being described by Naofumi to be really suited as a protagonist of dimensional-cross stories from manga or anime bishounen. He always dresses in black or dark colour. Later after two years time-gap when Naofumi's pick him from his world, he grew up to be more taller and has sturdy body due a result of a never miss training every day. He also has a mature-handsome appearance which perfectly labeled as an biseinen.
Ren initially mistook the world he was summoned to to be exactly like the VRMMO game from his world "Brave Star Online" where Level came first and Status Boosts second in priority making his strengthening method extremely inefficient also leading to the collapse of his party. He acts like cool loner but he really does care for his comrades. However, he doesn't get close to them because he is terrible at team play. He carelessly killed a dragon which caused a plague as well as other problems.