Character details:
Misbah Dhar is an all-around cheerful guy, but he'll never be afraid to give his honest opinion. If something's wrong, he'll let you know. He comes from a very extravagant and rich background (just look at his gold chain and boots), but he has always been humble. Sometimes he'll say something outrageous without knowing it, like "yeah, I'll just get my family's private jet to pick us up," but he's just clueless and has no intentions of boasting.

His key magical ability is invisibility, and he's a long-range fighter-- notice the bow on his back! When he does get into close-range fights, he harnesses his water magic to strengthen his hand-to-hand combat.

Voice details, line context, and voice reference:

He speaks with confidence and with care to those around him. Even during bad situations, he still spreads happiness and maintains an unserious vibe-- but he does know when to be mature. 
Luka from Honkai: Star Rail - https://www.youtube.com/watch?v=QASHppUdvUw 

line 1: He's talking about Vespara's augthorn addiction while he and Sylvie are trying to explain what augthorn is to Lunette. He puts on a serious tone and shows his condolences to the event. 

line 2: This is a dialogue between Misbah and Lunette. After a hard decision Lunette had to make, Misbah is trying to show encouragement to her and cheer her up.

line 3: During a battle, Misbah's invisibility was revealed by an opponent, and takes a punch to the face. The team on the mission with him was worried, so he said this to let everyone know everything was fine.