Ple-Sen
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I have concerns that it might be Shen himself. Although, as Heroist once mentioned, the Many-Faced Monogat seems like a more likely candidate.
Added 3 minutes later
But there are already many issues with Shen:
1) He conducts experiments with the otherworldly, so someone from the "Carnelian" might be used as a test subject.
2) He and Naria are plotting against each other, so being under his command isn't a great prospect (his son will surely quickly find out about any attempts to play a double game).
3) He doesn't like the Welfern and dreams of separating.
4) He's a former bandit with interesting quirks.
Added 3 minutes later
But there are already many issues with Shen:
1) He conducts experiments with the otherworldly, so someone from the "Carnelian" might be used as a test subject.
2) He and Naria are plotting against each other, so being under his command isn't a great prospect (his son will surely quickly find out about any attempts to play a double game).
3) He doesn't like the Welfern and dreams of separating.
4) He's a former bandit with interesting quirks.