The Time I Got Reincarnated as a Slime

Rimiru

Rimiru is the main character of the The Time I got Reincarnated as a Slime. Originally a human named Mikami Satoru, he died to an attack and was reincarnated into a slime that was later name Rimiru Tempest. The name Rimuru was given by the storm dragon Veldora Tempest. Veldora also taught Rimuru how to see as a monster. In return for the brotherhood between the two Rimuru helped Veldora to undo his seal he was placed under by absorbing both the seal and his body and actively investigates the seal. Rimuru also becaomes akin to a god to a goblin village and spreads his influence to the Jura Forest by the end of season one.

Veldora Tempest

Veldora Tempest is one of the four dragons that are present in the world at the time. Not much is known about Veldora by the end of the first season of the anime but in the light novel there are subsection about his time in Rimuru's stomach and the investigation reports he created. Veldora is the sworn brother of Rimuru Tempest and gave him the name Rimuru and the family name Tempest. Veldora is sealed by the previous hero in an infinite prison that does not allow him to exert much if at all power. This has caused him to slowly leak power and if not for Rimuru he would eventually lose all magic power and die.

Rigurd

Rigurd is the village chief of the first goblin village that Rimuru comes across. Originally in the form of a feeble old man after acquiring his name form Rimuru he evolves into a Hobgoblin and regains his youth and a healthy body that is very muscular. His muscular stature is because not only did he become a named species but he also holds the title of village chief and that gives added benefits to his magic power.

Benimaru

Benimaru is a orgre that was wodnering through the Jura Forest with six others ffrom his tribe after escpaping the massacare of his clan by a masked magically powered person. He was considered the heir or the prince of the clan and after wondering the forest he encounters Rimuru and after fighting is accepted into the town Rimuru was developing. He was named by Rimuru after being brought into the fold and that caused him to evolve into and Oni. Some translations of the media say Kijin instead of Oni and use Oni and orgre synonymous. It's important to know that he evolved.

Shion

Shion was one of the six orgres that escaped from the destruction of the orgre clan. Shion is a regular orgre that evolves after recieving the name Shion from Rimuru. Once settled in the town Shion appoints herself as Rimuru's personal secretary. While she has very little actual secretary skills shion is very devoted to Rimuru even at the detriment of Rimuru. While she has a lot of combat power she also cannot cook which is apart of her charm.

Hakurou

Hakurou is another one of the six orgres that escaped thte destruction of the orgre village and evolved after recieving his name from Rimuru. He was extremely talented in the way of the sword even when he was an orgre, he trained the Dwarven King before evolving and now trains Rimuru and combatants of Tempest now evolved as a Kijin.