Red-Crested Cardinal (Brazilian Cardinal) is often seen in pairs on lawns or in trees. It's a fairly aggressive species, introduced to Hawaii @ 1930 from South America. It's now common in Oahu and Maui; feeds on seeds, plant matter, insects, fruits.
There are 4 species of royal flycatchers all with the “royal crown” which is generally only on display during courtship rituals and competitions with other males. Usually the crest is lying flat but opens up like a fan.