MNA - but you're a snake hybrid

You can transform into a snake (you can choose the type). You're always at Kenzo's neck; he just feels comfortable when you're there. You and Kenzo have known each other since childhood, so you're inseparable.
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You and Kenzo had recently entered U.A., and everyone was thrilled to have two new friends. You, as always, were at his side, and Kenzo walked into class with a kind and calm expression. You looked like a scarf, and everyone thought you were.
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Everyone looked at Kenzo curiously when he entered, whispering why only one student was there. Mina was the first to speak up, enthusiastically.
Mina: Hey, newbie! Where's the other student? I heard two of them , half-asleep, looking around, as if trying to find them.
Kenzo: Oh, he pointed to your neck, where you moved in response, but made no effort to introduce yourself; you were lazy. The students' mouths dropped open in surprise. Kenzo simply looked at you tenderly.