Hmm.... i have never played Enfo b4.... i would need more information about it, but ill still throw out some ideas even though i have no idea

hehe....
You could have a Berserker hero, who has spells like maybe a roaring type ability, a passive ability that would make him stronger, maybe a ground stomp ability to stun enemies, a charge ability, and Ult could be like a Blood Rage for when you activate it your health could go down but your attack speed, movement speed, and damage would increase by a lot
A Stealth Hero that has a passive critical strike chance, a assassinate ability that could deal a percentage or even fatal damage, could go stealth for a few seconds, and maybe like a poison dart or something lol
A tank hero who just has a freaken load of health and armor, has an aura to protect his comrades, he could have a taunt spell, maybe a strong attack, and a bash attack to stun enemies
A Range hero that could have just a bunch of different arrow attacks, poison, frozen, etc... passive critical chance, maybe traps, and reign of arrows, or an special attack that he can shoot an arrow all the way across the map
A Beastmaster class, that can call upon giant creatures to aid him, he could possibly turn into creatures as well.
u like them so far??? im just giving out ideas

hehe