It seems this discussion has gone in a particularly strange direction.
In terms of tropes, Divinity already eschews tropes with their entire concept of elves. Rather than reusing the trope of elves just being "Pretty humans with pointy ears" they're more differenitated physically with elongated features.
As such, sticking to tropes is not in the cards by default. (Also, we have precedent in DOS2 where each companion could be anything. You'd assign them an initial class via dialogue where they comment on how good they are at whatever you ask of them)
Secondly, the bringing in of gender seems off-tangent for a topic about races. Not only that, but female warriors are in of themselves a trope, one that is rather popular (Especially to those whom are into Muscle Mommy's). Karlach doesn't buck any tropes, she very much embodies one. What would be subversion of the trope would be a warrior who was not physically imposing (Regardless of gender) and/or who disliked confrontation entirely. Not some musclebound meathead who loves to axe first and ask questions later.
Thirdly, human knight is not the defacto trope. It's normally the Dwarf race that gets the "Fighter" archetype, while Elves are given the "Mage" archetype and Humans get the "Ranger" archetype (On occasion Elf and Human archetypes are reversed. It depends on whether writers are more Legolas or Strider pilled).
As far as overall companion design goes... Ideally there's be at least 1 companion of each race (Well, technically, 2, one for good path and one for evil path) though this sort of design can often lead to underdeveloped "Token" characters that only exist to tick the box of having someone with a particular race (Or alignment... *Glares at Minthara*).
Though the very least there should be some level of diversity. Not just like 5 humans or 5 elves and then 1-2 other races. Even if you do proper origins so for example your Lizard PC starts in a Lizard town and has Lizard friends who follow them on their journey, you'd still want to have more diversity than that (For example, 3 of your race and then 5 of other races as potential allies)
Companions are a way to provide insight into other races. As not only do you get to see their interactions based on their race and how NPC's of various factions address them, but you also have dialogues where you can dive into their history and experiences. If all the companions are just bland humans who have no noteworthy interactions because everyone just likes humans in every setting because they're the bestest ever race to ever exist in the entire universe... Then you miss out on a lot of potential exposition in the lore for what? Maybe a few terrible sex scenes from a shallow "Romance" path that was shoehorned in because such things are popular?
