The most unique cryptocurrency ever made is Bitcoin, because it was the first cryptocurrency to be made to work on the blockchain. It was after the success of Bitcoin that other cryptocurrencies were made, and every cryptocurrency maker hopes that some day the coin/token will be like Bitcoin and some even believe the coin they created will do better than Bitcoin, the knowledge of Bitcoin has grown wider and has caused a spike in cryptocurrency adoption. Bitcoin is now so unique that it's rise and fall dictates the rise and fall of the whole cryptocurrency market in general; when Bitcoin rises the market rises and when it falls, the market falls as well too.