How about adding animals that will be guardians? They will be similar to a hero, just in an animal form.
Think about it, being able to have a guardian that can both attack and defend. There would be 1 animal hero/guardian which will be added one to th8.
The guardian will have its own strengths/special abilities.
Hero/Guardian: Wolf/War hound
Hit points: 500 DPS:75
Target: Any Speed: 30
Regeneration time: 1st Level 6 mins and each level thereafter 45 seconds added.
Defense radius is same as all other heroes. Also special ability radius same as other heroes.
Special Ability:
Sonic howl, which temporary (5 seconds) stuns defenses and ground troops (clan castle defensive troops) to a radius (same as rage for barb king) when it summons the wolf pack. The wolves summoned will have half the hp and dps of the guardian. Able to jump over walls.
This guardian/hero will have 20 levels. After 5 levels ability is unlocked (Sonic Howl and ability to summon wolves). Also at each level of 5, the stun ability will be upgraded to +2 seconds. With each upgrade, it will get a piece of armour (optional). First level will take an hour and every level after plus an hour.
Level 5 3 wolves stun level 5+2
Level 10 4 wolves stun level 7+2
Level 15 5 wolves stun level 9+2
Level 20 6 wolves stun level 11+2
Each level it is upgraded its HP goes up by 35 and DPS goes up by 15.
It would be unlocked in town hall 8. It would cost 150,000 elixir. Each upgrade would cost starting from 150,000 and increasing by 50,000 for each level. Levels 1-10 up-gradable in th8. 11-20 in th 10.
I think It may come in handy for inferno towers ETC with its stun ability. They'll go after the nearest defenses.
The wolf would be similar in size and proportionate to the current heroes. The wolves summoned will be smaller than the guardian. All traps (bombs, gaint bombs) will cause damage to both the wolf and the ones summoned. Only the summoned wolfs will be affected by spring traps from level 2 spring traps.
Back story: Just as ancient cities used animals for combat in war, the chief has captured and trained a wolf to fight and defend the village.

