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Maybe people already know this (I am late to the AI party lol) If you made a dreambooth model of a character you can actually take the character data from that model and transfer it to other models.
For example I made Kotoka model using regular NAI and transfered (using add difference in checkpoint merger) to another model to get this artstyle (no need to re-train).
Maybe this widely known and I am just an idiot lol.
I am gonna try this on a Moona model next.