Have the new hero be a elemental that changes every so often 4,8,12,24 hours or what ever. But it changes the game aspect to boosting attack power or defense ability of anything in game like t.h. defense's & resources farming to the toon's.
Have earth,wind,water,fire,heart (toon def),metal (t.h. def ,cannons,archers gear like that). Can use the hero an when it attacks it just has a random boost for so many seconds, an vice versa when defending t.h.!
Can change into male female look so it can boost the ladies or men up.
An if it goes water it can make a snow,hail,blizzard storm,tsunami to help in attacks or defense an real life season can boost or diminish the power it has at that time of the year!
Wind can make hurricane's,tornadoes, maelstroms an so forth.
Earth can make vines,sink holes, earth quakes,tree's insta sprout(spring board).
Fire make some defenses brittle,make attackers toons dizzy(wander aimlessly).
Heart boost health of everything for a set time with a mini regeneration. An can help with donated clan toons also
Metal helps defenses with extra hp/or gather more resources during that time while attacking others your resources at your t.h. boost 1.5 times more an increase per lvl up in increments like the air cannon (an this would be the 1st ability of the hero at lvl 5 t.h. to help level the player?
An ocassionally it gets the full buffs of everything that you have unlocked or just as a treat like the gems once a week for 4 hours!!
AN When the hero dies it produces one of each element with 1/5 of the main or how ever elements are used to make that hero.
Making this hero would make the game more interesting an less need to make more hero's as one can have multiple benefits