English:
Tartaglia
Chinese:
达达利亚
Japanese:
タルタリヤ

English:
Childe
Chinese:
公子
Japanese:
公子(こうし)

English:
Foul Legacy Transformation
Chinese:
魔王武装
Japanese:
魔王武装

English:
Ajax
Chinese:
阿贾克斯
Japanese:
アヤックス

English:
comrade / partner
Chinese:
伙伴 / 搭档
Japanese:
相棒

Childe, Shikanoin Heizou, and Navia call Traveler so. While Childe calls them "comrade" and Shikanoin Heizou and Navia calls them "partner" in English version, Childe calls them 伙伴 and Shikanoin Heizou and Navia calls them 搭档 in Chinese. In Japanese version, all three calls them 相棒.
Example

"It's a deal then, partner!"

「さすが相棒! そうこなくっちゃ!」

"I'll see you again, partner!"

「またね、相棒!」

English:
Northland Bank
Chinese:
北国银行
Japanese:
北国銀行(きたくにぎんこう)

English:
Tsaritsa
Chinese:
冰之女皇
Japanese:
氷の女皇(こおりのじょこう)

English:
Zapolyarny Palace
Chinese:
至冬宫
Japanese:
スネージナヤパレス

English:
Tsarevich
Chinese:
查耶维奇
Japanese:
ツァレーヴィチ

English:
Teucer
Chinese:
托克
Japanese:
テウセル

English:
Cryo Archon
Chinese:
冰神
Japanese:
氷神(ひょうじん)

English:
Snezhnaya
Chinese:
至冬
Japanese:
スネージナヤ

English:
Fire-Water
Chinese:
火水
Japanese:
炎水