"Me-too" implies copying or following someone else's actions without thinking for oneself. Synonyms for this phrase may include 'copycat', 'echo', 'parrot', 'mimic', or 'imitator'. These words often connote a lack of originality or independence, and may be used in a critical or derogatory sense. Another phrase with a similar meaning is "bandwagon jumper" or "follower". In contrast, words like 'collaborator', 'ally', or 'supporter' connote a more positive sense of working together towards a common goal, rather than simply following someone else's lead. Ultimately, the choice of synonym depends on the intended connotation and context of the sentence.