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.

After his identity as an Imperial Guardian was exposed, he started showing a more formal side of him in his military capacity. The difference in behavior from his time travelling with Masayuki shocked Rimuru, betraying his impression of Bernie being Masayuki's "long-suffering lackey."

Background
He was a graduate of Freedom Academy and an “Otherworlder” under Yuuki’s protection. Having been born in the United States, he could only speak English when he arrived in other 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 Eastern Empire, it became known that Bernie and Jiu were double agents and Imperial Guardians in the "Single Digits", who under the orders of Damrada, were sent to kill Rimuru. They were defeated and killed in the ensuing battle with Benimaru and Chloe, respectively. However Raphael quickly took notice of their escape using Resurrection Bracelets, which they secretly carried on their ankles during the fight.

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

Not too long after their escape, Diablo singlehandedly killed the duo; Rimuru resurrected them afterwards.