What races?

Comphex - Comphex live on a Harsh winter world, which gave them a really good immune system because of the harsh diseases, they are relatively peaceful and often help the player with business or a possible crewmate?

Alton - Altons are... special, they made their entrance in the milky way/andromeda when the humans discovered them on their planet, Owildon. Altons are great at trading, unlike other Aliens, similar to elcor in a way they don't use two legs, in fact. they have 3 legs due to radiation. they have some rotten apples as well, some cannibal in nature. which is... not very good.

Wakal-Sayotrah - Is an extinct race in the Prothean's time. nothing is known about them

Esaid - Esaid gets found by the Krogan while looking for new worlds, the Esaid are primitives, not even knowing that there were other life out there. they didn't even discover space travel. but the krogan made land-fall and they didn't take too kindly to intruders in their homeworld. so, like any sane person would. they attacked the krogan. But similarly to the Turians and Humans, the council stepped in and the Esaid were introduced to the new station.

How would the first contact meeting with the Altons go considering humanity have no clear Representative or Ambassador. Does humanity still have a say on council matters despite not having a councilor at the moment? Considering that most humans would sympathize with esaid since themselves were in a somewhat similiar situation with the Turians. The salarians would probably more than likely want go and reprimand the krogan just beacuse they have reason to or just remind them What happened last Time they were on a galaxy spread rampage ie genophage and threatening with a repeat.

Idk, I'm not a story writer at bioware. so it's their decision

i would say hackett or possible kaddien could take rains