Charys

Charys (カリス), formerly known as Ifrit (イフリット), was a Greater Elemental; the ruler of flames which was sealed within Shizue Izawa by Demon Lord Leon Cromwell.

He was defeated and captured by Rimuru Tempest but got released two years later and became Veldora Tempest's assistant.

Personality
Initially Ifrit acted like a feral animal with little sense of self, only acting on instinct and would not hesitate to kill the target he perceived as a threat to himself or Leon. This caused great angst between him and his host Shizu, as he would often lose control and attack indiscriminately.

After being imprisoned in Rimuru's stomach space, his interaction with Veldora gradually developed his personality and sense of self. By watching Rimuru's interactions with others, he also began to understand the feelings of people and the value of life, causing him to realize why Shizu was always at odds with him.

When he was released from Rimuru's stomach space, he had become a calm and rational individual, fully loyal to Veldora and Rimuru.

Background
He used to live in the Dwelling of Spirits before he was "stolen" by the "Platinum Devil" Leon Cromwell. After that, he was sealed within Shizue Izawa. As a result of this, she became a demonoid.

Trivia

 * "Ifrit" does not count as a name, but rather a name for his species (Greater Elemental of Fire). For this particular individual, he was nameless until named by Veldora, although he was constantly addressed as "Ifrit" until then.
 * He is one of the few individuals aware of Raphael's existence.