Good travel buddies: I'm gonna echo ehyde and say Wen Ning would be pretty nice. And Lan Wangji if he could just travel and not sigh forlornly at every turn because Wei Ying wasn't there. Luo Qingyang could also be nice! And Xie Lian (but alone). Jin Guangyao (but no murder, please).
Terrible travel buddies: Shen Qingqiu would probably fret all the time that he's OoC and it would be too stressful. Wen Chao, Jin Quanghsan (do I need to say why?).
On the fence: Wei Wuxian, Hua Cheng, Luo Binghe, Xue Yang: on the other hand they would be entertaining but on the other hand it could go Very Terribly.
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Terrible travel buddies: Shen Qingqiu would probably fret all the time that he's OoC and it would be too stressful. Wen Chao, Jin Quanghsan (do I need to say why?).
On the fence: Wei Wuxian, Hua Cheng, Luo Binghe, Xue Yang: on the other hand they would be entertaining but on the other hand it could go Very Terribly.