Canonically, Poporon is probably the most beautiful character in the series. She gets regularly complimented by complete strangers for her beauty, and in a short timespan has created a fanbase of hundreds of men. The only other girl who gets coplimented on her beauty by strangers is Medusa, possibly her only contender.
I love her the most, but Pekora is probably considered the most ugly in canon. Despite obviously being a homeless and starving young girl, not a single man offers her help off the streets once in the series. All her male work colleagues treat her like shit, and she can't rely on her beauty to get jobs like Poporon.