[quote=@Willy Vereb]
<Snipped quote by Keyguyperson>Well, that puts damper on quite a few things.
I can still make this faction but I have to change almost everything about it.

I have two ideas which can work.
1.) They are descendants of colonists participating in a long range FTL jump experiment. They were thought to be lost but actually they were sent to a distant planet while also displaced in time. They built up their own unique civilization which barely resembles yours.

2.) Parallel development theory. Star Trek loved this excuse. Basically we are humans that developed on a different planet but very similar to Earth. Our language and culture has eerie level of similarities at times yet we are also quite different in other ways. If you watched the original Star Trek series you know what I am talking about.

Ironically I think 2.) violates our suspension of disbelief the least. We just need to come up with a name which makes my humans distinct from yours, at least when we refer to each other.
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I think the first one actually makes the most sense, Time travel gone wrong could explain why other species might be humanoid as well, descendent from various human colonies. Sure they might have a few differences but perhaps the colonists did some genetic engineering to adapt to the environment and somehow regressed to an earlier technological state.