I’ll create a standard 5 mm through-hole common-cathode RGB LED component by first checking available library parts, then adding/configuring the best match with the correct role and package metadata if editing is permitted.
I searched for a 5 mm through-hole common-cathode RGB LED and did not find an exact Flux library component. The closest match is a 5 mm through-hole common-anode RGB LED, but I did not add it because it has the opposite polarity; I submitted a missing-part request for the common-cathode version.