1. A person that is easily controlled by others.
2. A person that conforms to pointless ideals set by others.
3. A person who changes opinions or views rapidly based on someone else's views/opinions.

Briefly, "the realization that each random passerby is living a life as vivid and complex as your own." Originally from the Dictionary of Obscure Sorrows, which has a lot more beautiful neologism definitions like this you might enjoy.

1. A person not capable of forming his or her own ideas. Often, the person will adopt a set of ideals and protect them vehemently by ridiculing other peoples' values.
2. A person being manipulated, whether he he realizes it or not. See: tool

Something controlled by something else.

puppet / puppet government

- A person, organization, or government that is highly influenced by and acts on behalf of another party. The puppet will often do as the other party says without too much resistance and may be seen as afraid to think or act independently, sometimes in fear of possible punishment by the puppet master.

An alter ego created on an message board or news group primarily to troll.

to overload on blusher/bronzer type cosmetics, resulting in unattractively firey cheeks.