Rudolph could probably explain it better than I could. I don't know how it works, or the reasons behind the choices, but apparently each individual fragment of Lord Klaus' power chooses its own successor.
[The original Santa must have been positively saintly; he's just a Grumpy Tsundere Santa, sorry.]
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[The original Santa must have been positively saintly; he's just a Grumpy Tsundere Santa, sorry.]