Does anyone know what the tattoo on Karlach's upper back says? I noticed it briefly during a dialogue.
Also, Karlach's story is rich for future content. I don't think Larian will pass up the opportunity to use Karlach as a sort of binding agent to various plot points throughout all the acts and potential expansion/sequel material.
The character was apparently revised close to release, but regardless of that, it ended up resonating to such a magnitude with so many that it cannot be ignored.
Larian's quick response to the floodgates of feedback regarding Karlach shows this. The community feedback thus far as likely kickstarted new ideas on their end already.