Ferdinand is a human, wanted in the Federation for smuggling medicine to pre-warp planets. He joined the Amalian Expanse and was quite helpful in shaping policy on export restrictions. Technically the Federation didn't know he was here, though it was established during negotiations that they would have no obligation to report or penalize people whose actions would be legal had they been part of the Amalien Expanse. Neither side wanted the hassle of dealing with that.
Nupe is the one with the really long tongue. Yes, she does have a second mouth on her tongue. Yes, that second mouth does itself have a tongue. No one knows how many layers deep it goes. Her species was one of the ones given warp by Amaliens during the war.
Kora is a Ferengi - her father organized the financing of the Amalien Expanse war in return for 1% of whatever was left of what he raised after the war. He'd become extremely wealthy, and had been instrumental in modernizing the amalien economy ever since. Of course, he'd taken a small share of the verifiable GDP increase resulting from his expertise. The Amalien Expanse was lucky to have him, and it was hoped his daughter would become just as wealthy in just as mutually beneficial a manner.
The cyborg looking one sitting alone is sort of actually an amalien, just assimilated by the borg. The amalien explaining this looks uncomfortable discussing her.
The man and woman with pink freckled faces sitting silently on opposite sides of a table, alone, are Vranthir. No we don't understand their gender norms either, but they seem to be happy like that.