Where can I get acquainted with the characteristics of this coin? and why the volume is so small...
Discord in kingcarsen's profile link is a good place to start. Daily volume is low because daily emissions have dropped a lot recently with POW rewards going from 3 Denarius to 0 Denarius, and the coin is still very much under the radar.
I agree that Denarius is under the radar which it has been since it launched. The thing I always say is that all good things take time and exposure will come naturally as more developments are released. I've been staking D since the start and been buying a little each time I have some spare BTC.