柔情少女百毒不侵刚强少年刀枪不入
[róu qíng shăo nǚ băi dú bù qīn gāng qiáng shăo nián dāo qiāng bù rù]
Describes an affectionate yet strong young girl who is immune to poisons, and a robust and fearless young boy who cannot be hurt by swords or bullets. Implies a combination of gentleness yet resilience.