Question

alter ego

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al∙ter e∙go / ˌæltə ˈigo ; ˌæltər ˈi:gəʊ /
◙noun [C]
1. sb's alter ego, an invented person that you use to represent part of your character that is very different from your usual one
• 某人的第二自我，某人个性的另一面:
 »Gissing used his fictional alter ego to attack Victorian morals.
  吉辛用小说中的第二自我攻击维多利亚时代的道德观。
2. someone you trust and who has similar opinions, attitudes etc
• 至交，知己，密友:
 »Mrs Reagan was widely regarded as the President's alter ego.
  里根夫人被普遍认为是里根总统的知己。