I still read their speech-bubbles in English, but I appreciated the novelty that a Japanese or French voice provided (you could even learn some new words this way!). I eventually found their obvious hints and breathless compliments grating, but you can turn them off, or, as Director Shiro Mouri has recommended, change the language they speak to one of the many available in the settings.
They'll point out curiosities as you pass them, crack jokes, or scream for their lives. The first, Talking Flowers, are exactly what they sound like. But the game provides tools to assist with the hunt. You can easily beat levels without ever finding Wonder Flowers hidden under snow drifts, lurking in blocks, or guarded by baddies. But standard levels also conceal a Seed you can only get by finding a Wonder Flower and playing through the lunacy it unleashes. You can usually get each level's first Seed through the typical method: run to the end and jump on the flagpole.
Castle Bowser looms over the map, his minions sowing chaos across the Flower Kingdom.