Adorkable / One Piece

• In the Straw Hats, we have the not-too-bright Luffy, adorable doctor Chopper, and Lovable Coward Brainy Brunette Usopp. Even Robin, despite being an Aloof Dark-Haired Girl, has her moments every now and then; she sometimes has cutesy and silly Imagine Spots, she gets Cuteness Proximity near Kanjuro's Rising Dragon to the point of leaving flowers at its "grave", and in Film Z, she has a watering can shaped like a cartoony zombie.
• Outside of the Straw Hats, Boa Hancock of the Seven Warlords of the Sea is this, but only around Luffy. Hancock is usually too serious to be adorkable, but she acts like a Smitten Teenage Girl around Luffy, has frequent Imagine Spots about him, and tends to misinterpret a lot of what he says as proposals or declarations of love.
• Tashigi has shades of the trope, being competent in battle but a Cute Clumsy Girl with a great love for swords outside of battle. She's also prone to mistaking random people for her superior officer Smoker without her glasses.
• For a spoilerrific example, we have Charlotte Pudding, who is a double subversion of the trope. When the Straw Hats first meet her, Pudding is very kind, ditzy and dreamy, seeing Sanji as her prince charming. Then, her true colors as a cruel and sadistic person get revealed, and her adorkable aspects get chucked out of the window. However, when she pulls a Heel–Face Turn, she becomes adorkable again, being constantly flustered around Sanji to the point of acting like a Tsundere.
• Shirahoshi is an adorable young princess who, due to having been sheltered in her room for a good portion of her life, has a giddy reaction nature to seeing new sights that is really too cute for words.
• Coby is a shy and timid boy, and even after taking several levels in badass, remains as flustered as ever when his heroic deeds are brought up.
• Fearsome and violent though he may have been introduced as, Bartolomeo is a huge fanboy of the Straw Hats, and gushes around them every chance he gets.
• O'Tama is an absolutely adorkable kid who turns the tide of the Onigashima War in favor of the Straw Hats & Cia all by herself. Nami, Luffy, Zoro and Usopp are pretty fond of her with Nami suffering a Cuteness Overload when Tama ends being a kunoichi apprentice under Shinobu's guidance.