Hey all!
Just heard back from the team, these appear to be intended. But will be reviewed in the future.
Daemon Gnome - Currently aware it is only dropping one compared to the other common Gnomes which drop x4. Linked to when that troop first released. Intended at the moment.
Mana Surge Gnomes - Believe this is due to Mana Surge Gnomes being new a new Troop.
The Emperor - Even though a Legendary, as it is used to craft in the Soulforge it will drop x1 compared to Cedric.
Again, I brought all of this up with the team and they plan to review it future.
Jeto - Support Human 