List of characters I consider suspicious.

univeil-chars.js

// nodejs -p 'require("univeil").rgx.nonprintGroups;  // v0.1.8 +'

{ asciiControlChars_nonpr: /[\x00-\x1F\x7F]/g,
  generalPunctuation_nonpr: /[\u2000-\u200F\u2028-\u202F\u205F-\u206F]/g,
  latinSupplement_ctrl: /[\x80-\x9F]/g,
  nbsp_nonpr: /\xA0/g,
  privateUseArea_untrust: /[\uE000-\uF8FF]/g,
  softHyphen_nonpr: /\xAD/g,
  specials_nonpr: /[\uFFF9-\uFFFF]/g,
  variationSelectors_nonpr: /[\uFE00-\uFE0F]/g,
  zwnbspAkaByteOrderMark_nonpr: /\uFEFF/g }