I always thought it was strange how they specifically made it so the Jackal couldn't get the Bulldog mag (Bessie is more understandable). But if the Nemesis gets the Invader scope, it's only fair the other pearls get to be hybrids.
Now that I think about it, I probably should have made a Guardian body Avenger possible. I also planned to make the Stalker capable of being elemental, but I need to make new accessories and projectiles for each element to preserve the ricochet effect. I'll probably update these things when I have time.
And nice Bessie @BlackHeartV! The hardcore set is really fun. I still haven't found a "legit" pearl from this pack.