Extra Quest (optional)
Already have, or create an Exo character.
Imagine Rasputin could take over your Exo character. A whole Rasputin quest opens up. Class abilities unlocked/enhanced or even Warmind ability trees for whilst you are his puppet.
Perhaps you lose your ghost, but with Rasputin's power running through you; you can open doors by yourself and scan stuff with your own eyes, summon your own sparrow, fast travel, etc.
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Why not have a unique story mission for your race so it’s more relevant. And maybe Rasputin speaks through your ghost, like Sagira, or Rasputin and your ghost are fighting for control, one minute your ghost is talking the next is Russian dialects