Bernie

Bernie is an adventurer and the third member to join Masayuki's party. He is a Stray Otherworlder who was born in the United States.

Personality
Bernie was often the voice of reason in the party, constantly looking out for the team and gave Masayuki a lot of advice. He appears to be able to resist Masayuki's "Chosen One" by possessing a Unique Skill, but he respected Masayuki regardless.

Background
He was a graduate of Ingrassia Academy and an “Otherworlder” under Yuuki’s protection. Having been born in the United States, he could only speak English when he arrived in this world, making communication with Yuuki completely impossible. That’s when magic came in handy, and ever since then, Bernie became obsessed with magic, hoping to study at the academy. He became an adventurer rather recently, and he was looking for companions. That's when he joined Masayuki's party.

The party progressed at an overwhelming rate. In only about half a year, they were given the nickname “The Shining”. Although Jinrai was ranked C+, his strength was comparable to that of a Rank B. With the additional aid of Bernie's magic, they were able to safely handle any quest they attempted.

Later during the war with the Empire, it became known that Bernie and Jiu (under the orders of Damrada) were in reality double agents and Imperial Guardians in the "Single Digits" who tried to kill Rimuru. They were defeated and killed in the ensuing fight with Benimaru and Chloe, respectively. However Raphael realised quickly that they escaped using Resurrection Bracelets that they wore on their ankles.

Based on the information from Chronoa, it was also suspected that they killed Rimuru in the different timeline as well.

Later Diablo, singlehandedly killed both Jiu & Bernie, and Rimuru resurrected them using a pseduo-soul.