Out of all antagonists in the Titototter series, Shadow appears more than the other antagonists, which means he is the overall main antagonist.
Unlike the other Titototter antagonists, Shadow does not seem to get defeated or punished for his actions. However, in Sonic Gets Kicked Out!, he was kicked out of Sonic's house just like how Sonic and Silver were kicked out. But, shortly after Sonic and Silver left, Shadow came back to the house. He later left after a short fight ensued.
Shadow is an evil, mean, homicidal, unfriendly, aggressive, angry, violent, cruel, sadistic and uncaring hedgehog who likes committing crimes. He is clearly aware that he is evil and he even described himself as the definition of "Pure Evil".
Unlike his original counterpart who is a villain but occasionally an on & off anti-hero, this version of Shadow is completely evil and was never an anti-hero. In fact, he does not redeem himself or show remorse for his actions at all.
Shadow is more evil than the other antagonists in Titototter due to his serious and dangerous actions.