Geralt isnt cool or mysterious, hes just severely socially inept.
Him sitting dramatically in the darkest corner of a tavern isnt because hes being a cool monster hunter and gatherig intel on the local population, its cuz when he came in the tavern the layout confused him, and instead of walking around like an idiot he sat at the first empty table he saw, and then when he did get his bearings it would be weird to sit down and stand right back up again to walk to the bar and ask for a room so he sits there for an hour and twenty minutes silently reevaluating every choice that led up to this moment.
The woman trying to strike conversation with him thinks the witchers not replying because he thinks hes above her, in reality, Geralt would rather eat his own foot than enter in conversation with a stranger.
Jaskier going on about a story from his childhood and pausing every now and again for Geralts input, his disinterested grunts seem aloof and busy, when in reality hes so distracted by the curve of Jaskiers mouth and the gentle curl to his hair in the humid night that he fears trying to speak would result in an unmitigated disaster.
