Alright, so we have the Avenger of Bread Pudding, the Mistress of the Clocks, Jimmy McMagic Dictionary, 'ForgeFace, and the Lady of the Dance. Also unmentioned is The Silver Lady Reborn.
So Isa and Jal are friends having met in Sharn when Jal was just a lost confused exCyran.
Mark 24 is terminally uninteresting persona-wise. Perhaps he lounges around the tavern because in tales that is what adventurers do. Perhaps he has attached himself to the Sorcerer Jal. 'Forged warriors are often trained to defend the weaker battlefield spellcasters. For his part Jal will be friendly if somewhat put off by Mark 24.
For her part, Isa is extremely interested by the warforged. He is the pinnacle of her art, the infuion of life into unliving matter.
Knya has relations with Isa because she purchased a toy of some kind for her sibling. How about a music box?
Knya and Valhandra may have met because Valhandra is lost and completely culture-shocked. She didn't understand the Sharn-an culture, so she sought out the elves of House Phiarlan for assistance. Knya befriended the warrior as the Phiarlan's turned her away (she's not in the House and her mystical rhetoric is almost quaint, afterall).
And around this all is the kindly bartender/bouncer Rhunila who listens to our tales and tosses back a few along with us as the sun sinks below the mountains and the days end.