Your Ideal Canon Races/Classes/genders/alignment

In an as objective way as possible, i think nearly any species works for the Pub characters, except probably Chiss and Purebloods who seem less likely.
BH and IA would prbably work with any species, though i'd probably see the IA as either human/cyborg or Chiss.

For both Sith though, i think only Human/cyborg and Pureblood can work, with a higher probability on Pureblood for the SW and on human/cyborg for the SI.
The SW is clearly stated to be from a well know imperial / sith family so they can very clearly only be human/cyborg or Pureblood. And the people the closest to Vitiate : the Hand and Scourge are all Purebloods, so i'd go with Pureblood as the most logical here.
The SI is clearly supposed to be the same species as Kallig and considering the shape and size of his mask, you can't fit a Twi'lek, Nautolan or Togruta's head in that, that'd probably exclude Zabraks too because of the horns. Then, the SI becomes a member of the Dark Council before Ilum and during Annihilation, which takes place after Ilum, most of the SI's fellow Dark Council members are completely against Karrid becoming one of them because she's an alien, indicating there are no alien on the DC, and there are no aliens on Acina's DC either.
So that leaves only human/cyborg and Pureblood, but Zash refers to Ffon as "the red one", so the SI is most probably human/cyborg.


Now, for my favourite combinations (even when they contradict what i think would be the most logical canonicity) :
- JK = female, human-Echani hybrid (obviously human ingame), Sentinel, so with an Ahsoka-like fighting style, but personnality-wise more of a mix between Obi-Wan's snarkiness and Anakin's impatience and recklessness. She tries to be a "perfect" Jedi, but is a bit too passionate to really be good at it. In a romantic relationship with Theron Shan.
- JC = male, Iridonian Zabrak, Shadow. He's calm and wise , loves reading and learning all kind of things, he is exactly what you'd expect from a Jedi
- Trooper = female, Nautolan, Vanguard. A true patriot, she'll fight for the Republic but will refuse to follow orders if they go against her moral values, which more often than not puts her at odds with her hierarchy. Maried to Aric Jorgan
- Smuggler = female, Twi'lek, Scoundrel. She likes traveling the galaxy and wants a nice, comfortable life. Loved flirting with any male she encountered, but ended up with Koth Vortena.
- Smuggler bis, as i like them both equally = male, Rattataki, Gunslinger. A big teddybear who'll do anything for the people he considers to be his familly, and will kill anyone threatening said familly. Maried to Akaavi Spar

- SW = female, human, Juggernaut. Rather neutral, she's an honorable warrior who wants to protect her people and fights for a cause she could believe in. She's an overal nice person to be around, but don't get in her way, and don't think she's weak or an idiot, that'd be your last mistake. In a relationship with Arcann.
- SI = male, human-Pureblood hybrid, bastard son of a Pureblood Sith lord and one of his human slaves, Sorcerer. He's a cunning survivor who'll do everything, no matter the cost to be free. There are 3 things to never do while dealing with him : think you're more intelligent than him, try to force him do something and try to kill him as it'll usually result in a painful death.
- IA = female, Chiss, Operative. A cold and very professional agent who'll use any asset, including her own charms to accomplish her mission. She'll try as much as possible to keep the collateral damages as low as possible, but the mission comes first. After being brainwashed, she turned her back on the Empire and joined the SIS, but her true loyalty goes to the Ascendancy. Maried to Vector Hyllus.
- BH = female, Mirialan, Mercenary. She became a BH to get revenge on the people who murdered her familly, won the Great Hunt to take revenge on the man who killed her mentor. She has a habbit of adding facial tattoos whenever she kills one of the people who wronged her. She then found a new familly with the Mandalorians, and will follow them wherever they go. Maried to Torian Cadera.

SI is clearly intended to work with alien species. Kallig's helmet can't really be used as an argument story wise since it hides the lekku/horns on the PC as well. It's just a visual design/modelling limitation. Also there are Twi'lek specific dialogs in the SI storyline, as opposed to the generic alien ones, they are definitely intended.

Inclusion of one alien on the DC probably wouldn't make them any happier to include a second, and Acina's DC was formed when the PC was a block of carbonite, so I don't see how that's relevant

About the only one that doesn't really work is Pureblood