BTC - because, Bitcoin
LTC - again, because Litecoin
ETH - I like the idea of a blockchain that was devoted as a hosting platform.
IOTA - Because, the Internet Of Things, and I like what this is promising in a number of different tech applications.
EOS - This is still a mystery to me, but I had a hunch. It's paid off.
STEEM - need I say more.
Electroneum (ETN) - This smartphone app designed to help popularise the daily everyday use of cryptocurrencies. I bought into the ICO, so far only trading on Cryptopia.
BTG - I only have a small amount received from the hard fork as I had some BTC in Freewallet. I'm a bit pissed off, because the amount is too small for me to send into another exchange, wallet, or to trade into another token. So not entirely sure what to do about this, as I have no plans to buy any BTG.
HOLO - not a coin (yet), but I have invested in the Holoport and will be mining once we go live next year.
I've just heard about SKYCOIN, and want to investigate further before buying some - again, only trading on Cryptopia. But I feel it's purpose is aligned with my interest in Blockchain/Crypto