Nomadic (Hunter-Gatherer hominids constitute over a million years of human history, sedentary living only a few thousand. Modern history has a romantic view of exploration and seeking beyond new horizons, pioneering spirit, etc so it works in that same vein too)
Adaptive (Humans have permanent populations on every continent and environment on Earth except for Antarctica, even the Sahara)
Deviants (Human cultures are incredibly diverse, individuals constantly attempt to challenge the status quo. We also need a negative trait, and this is the best fit)
Quick Learners is also acceptable. Humans are born early and undeveloped. They are sponges for their environment and are constantly learning new things as they grow. Other animals are much more instinctual and less of an blank canvas. We have no aliens to compare ourselves to, same as for the other traits, so we can only make educated guesses, and one assumption we might make is that due to our unique biology (cranium, bipedalism, small hips, undeveloped infants), we also rely far less on hard coded behaviors compared to a hypothetical alien species.
For ethos, it's much more up in the air. I think Spiritualist is a must. Atheism/Materialism etc didn't really exist in any meaningful, widespread form until a few hundred years ago, and even now, even with less religiosity within Western societies, we're still incredibly spiritual. Even extends to things like astrology, belief in fate or hidden meanings, luck, something greater than ourselves, etc. Our governments might not be spiritual in nature, even outside modern times, but the populations certainly were and are.
Xenophobe is also a good one. Nationalism, patriotism, tribalism, factionism, and so on are all the exact same thing. People based their personal identity off a some notion of an "us", always in conflict with some abstract "them." This "us" and "them" can take whatever form. And history is definitely not on our side. Without fail, anytime one culture meets another culture, and one of these cultures has the means to conquer, assimilate, or exterminate the other, it happens.
Final ethos I can't decide on. I can see arguments for Militarist (most advanced, agrarian civilizations are in a near constant state of war since prehistory), Individualist (similar reasoning to Deviants, but doesn't work so well for Stellaris-brand Individualism since its based more on egalitarianism/liberalism) and Collectivism (probably the strongest contender imo, most human societies are authoritarian in nature, individuals typically strive to advance their own group even at their own personal expense, although there's a bit of overlap with xenophobe for this one. Only Western societies are really anti-collectivist)