我不会是凹凸曼
[wŏ bù huì shì āo tū màn]
'凹凸曼' is a superhero character from a children's animation, which might not be widely known outside China. The netizen name means 'I am not凹凸曼'. User probably wants to present oneself in a different way from this cartoon hero, possibly suggesting being real, non-heroic, and down-to-earth.