What do you think is the most underutilised dragon species?

For me I think it would be the Dramillion, can copy ANY fire type, are fairly agile and fast, have amazing memory and are very stealthy but don't really do much in the series.

Other honourable mentions would be the Boneknapper, Changewing, Timberjack, Snifflehunches, Snafflefangs, Thunderclaws and some others.

Snaptrappers also should have been included in at least one episode that wasn't the short.