Expy, as defined by TVTropes, is short for "exported character", meaning a character exported from another work. An Expy is a character based on another character from another work, but within this definition is a bit of wiggle room which can lead to errors in the novice. Let's first examine what an expy isn't, and then why anyone would want to make an expy in the first place.
An Expy is NOT:
a Captain Ersatz
Ersatz, German for "replacement", should tell you all you need to know about the difference between the two characters. A Captain Ersatz is a generic replacement for a character, while an expy is an adapted or expanded version of a character. Think of an item from a fast food restaurant: a Captain Ersatz is a similar item from a knock-off chain, while an expy is a homemade meal made with