Can I play Champion Units that share a region tag with my legend, but aren't the same character as my legend?

Ruling: Champion units are main deck legal if they share a domain with your legend. Champion units are chosen champion legal only if they share a character tag (like "Jinx" or "Viktor") with your legend.

Nuances:

• Region/unit tags (like "Zaun" or "Freljord") currently have no bearing on legality in your main deck or chosen champion zone
• Legends always refer to a specific character, so your chosen champion must be the same character
• Currently no legends have region tags, though this may change in the future