So today I was lying in bed recovering from Covid, dizzy and congested, when I noticed that I only have two budgies.
I have three parakeets — Peek a Boo, Periwinkle and Yo Yo. Boo boo is the bold solid yellow budgie; Periwinkle is the blue one. Yo yo is the green male I got later. Boo is female. I thought Wink was male but he was the one sitting in the coconut. And when we found him— he had eggs.

So, looking closer at Wink as “he” came out to see the food and nesting materials I put out for him, he appears to be a she and Yo appears to be his mate.
I guess Wink’s face and beak look so blue because she’s blue.