Sharlene Chen is a character from Cardfight!! Vanguard who fights alongside Team Dreadnought. She's one of Leon's servants and happens to be an identical twin—her sister is Jillian.
Fans often note that Sharlene has a pretty forgetful streak, which draws comparisons to Ren Suzugamori's personality. By Episode 101, she's developed this quirky habit of speaking in a singsong voice, and she's surprisingly vocal about praising Ren, which has given players some interesting theories about the dynamic between the servants and their leader.
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