The Goblin King and LEVEL 7 Goblins
Add some more single player campaign missions and after Defeating the last mission, The goblin king will serve you and u can take it war or it will defend your base while defending
1. It will target resources(2x damage), just like the goblins
2. It can upgraded upto level 40, like the other heroes
3. it's speed should be very fast
4. i can't decide it's stats' i(f tou like this idea just drop stats in the reply)
level 7 goblins ; as you have introduced level 7 barbs, archers, giants. goblins is the only troop that require level 7 now that can be upgraded on th10 and level 6 goblins should unlocked at th9
that's all i have to say it's a good idea, think of it, it's a good idea, it's all up to you now