Technically not an altcoin but I'm going to go ahead and nominate CRYPTOKITTIES to the poll.
1. First blockchain game on Ethereum
2. First ever DAPP that, while pushing ethereum's transaction scaling issues, is a great example of why ethereum is a real working platform for smart contracts and dapps
3. Appealing to a massive demographic that allow's newcomers get familiarized with crypto in a fun and friendly way
I would like to hear others thoughts on this one since I have no idea about .... well anything about it.
How was it distributed?
is it even a project people can invest in?
It seems it has a REAL use case and is developed but the other 2 would need to be there....
If it meets the criteria in the OP
( i might need to update the criteria because I had assumed people would post projects where investment can be made) perhaps you can invest in crytpokitties and hold it like and alt I just hadnt looked at it or heard of it.
Sorry if these sound strange questions
I hope others familiar with it can chime in but sure it's possible to add if other think it meets the criteria or you can demonstrate it is suitable to be put with other REAL alt projects people can invest in.
thanks for the suggestion.