Groups that actually take member colours seriously?

I've been looking at jpop groups recently and a lot of (non-rotational at least) groups will have members consistently wearing their member colour, even as their main costume changes over time or different outfits for different concerts or whatever.

However, I don't see this in kpop often tbh???? Other than debut era Red Velvet with those... interesting hair dye jobs.

I am not at all interested in hearing about groups where they have member colours but they are rarely used!!!!! I know most groups will have member colours, but they are always under-utilised!!!! I'm interested in groups where they are actually used a lot!!!!!!!! Thank you!!!!!!!!!