Well. I was thinking about Sword of the Stars which is made by Kerberos Productions, which limits me to the races, so Giant, Sentient Mammal Bugs, Humanoid Lizardmen, Space Dragons, Humans (Ofcourse), Hyper Agressive Psychic Dogs, and Psychic Space Whales.
As for the top three characters, a Human in a Brawler Suit, http://nickersonm.com/sots/loading_splash/Human_BrawlerSuit.jpg
A Hiver Warrior or Prince, https://fbcdn-sphotos-b-a.akamaihd.net/hphotos-ak-prn1/68953_10151339799935926_248132915_n.jpg
And a Morrigi Warrior - https://www.weasyl.com/~ludocrow/submission/250013/ludocrow-fanart-morrigi-striker.png
As for why, Gotta have a human in oversized armor, it's just necessary, Hiver Warrior or Prince, the Hivers are a very interesting race to me, they focus on rather than training their young to be good at something, they just breed them for a specific trait, and the Morrigi Warrior, I love dragons.