Okay!
Name: Rai
Visuals: He has white hair that slowly turns into violet at the end of his hair, similar to Venti's hair and Zhongli's hair in Genshin impact. At home, he usually wears a thin lab coat so that he can be ventilated while covering himself of harmful substances. Outside, he wears clothes that make him look like a noble, especially with his very attractive looks and captivating violet eyes.
Description: His voice is soothing and captivating, as if when he tells a story, he could lull anyone but Kuro to sleep very easily because of how calming his voice is. His atmosphere is also very calming, making you off-guard when with him. However, that's just him when you're just with him. His real personality is of a researcher, being very curious of Kuro's origins being an other worlder. He's also kind of a jerk at Kuro, feeling as if he was the brother Kuro had in his past life, laughing at him and reminding him of embarrassing moments Kuro had done. Like Kuro, he doesn't want them getting injured and prioritizes them the most. He always answers Kuro's questions truthfully if his were to be answered the same, but Kuro knows that he has a dark secret he doesn't want to others to know of.
Name: Kurokawa Yoshiuki (Hero)
Visuals: As a Japanese person, he has short black hair and black eyes, his hair grows longer in the future. He was first seen wearing a school uniform along with his classmates when they were summoned to another world. As a hero, he uses a small shield on his left hand while he carries a fucking claymore (his holy sword is specially crafted) with one hand. His armor consists of a tight sleeveless garment while wearing gauntlets and armored boots for close combat when need be. He also wears tight boxers with crotch covering. The reason why he needs light armor is for movement purposes.
Description: As a Japanese, he's quite shy. He's a pushover at first, but after living in the other world for 5 months, he now knows that it isn't Earth where everything is at peace, but rather, is a brutal and cruel world where peace never existed for some beings. In the end, he becomes more matured and level-headed, abandoning his Japanese culture of not bothering anyone into someone everyone can call a hero. He retains some qualities however, being kind and caring to others, even when some of his classmates' personalities take a wrong turn for the worst, with his goal being to get everyone back home while not regretting anything in the new world.