https://en.wikipedia.org/wiki/Complementary_currency
There's no need for a blockchain, or distributed stuff, etc. The only thing you need is to convince people to accept it. You might as well make an app that transfers balance between rows on a database. And the reason why you never heard of complementary currency before, is that it's something done "just because you can" and has no real advantages.
I understand that none of the things I said are specific to you. But am I wrong?
There's also no dependency or trust on hexel per se once the coin is created. They can disappear, but the contract/token lives on.
Definitely upside for using Ether, but comes at a price in transaction time and money.
The cool think about tokens is that they can be programmed to behave different ways. Can you imagine a world where each currency is programmed differently? For example, maybe one currency gets deflated with each transaction (gets multipled by 0.9), and another currency can only be sent a certain number of times before it disappears, encourage people to hold it. Can you think of use cases where that changes the utility of a complementary currency? I'm asking because I can think of a few, but it's so hard to tell whether or not they're good ideas.
The second part, outside of that, is that tokens are on a blockchain. Again, none of this is specific to us, but there are a few properties that any token gets. Namely: They are provably scarce, they can interact with smart contracts, and they can be traded for other currencies if necessary.