If you pick a base character then the prime gets removed as well, the better version cant exist without the base version, however if you remove a prime version then the base character can still exist. My personal pick would be Valkyr due to how [IMO] useless she seems
Yeah, as a dragon frame Chroma doesn’t deliver on being a dragon in the slightest (western or eastern dragon). His 1 is more of a spit than actual breathing fire/ice/etc. and the rest of his abilities have nothing to do with being a dragon. Zephyr is more of a dragon than Chroma is.