On akali and built in healing through damage/applications of damage available to top lane champions
Dodgeable, must interact with enemy laner and hit a specific region with his decimate to gain the heal. Missing % (Strong at low hp and non existent at high hp)
undodgeable, inclined to interact with enemy laner with empowered Q, otherwise healing gutted to 35% efficacy when used on a minion. Empowered Q requires charges from previous uses of Q and only lasts for 2 seconds (can be elongated through use of E and W).
undodgeable (procs on hit), no need for interaction with enemy laner, full heal is available on anything he auto attacks.
undodgeable (procs on hit), no need for interaction with enemy laner, full heal is available on anything she auto attacks.
dodgeable, must interact with enemy laner and hit a specific region with her W to gain the heal. Heals based on damage dealt.
dodgeable, must interact with enemy laner and hit a specific region with an auto or parry to gain the heal. Heals based on her AD along with a base heal.
undodgeable (procs on hit), no need for interaction with enemy laner, full heal is available on anything she auto attacks.
undodgeable (procs on hit), no need for interaction with enemy laner, full heal is available on anything he auto attacks.
Dodgeable, must interact with enemy laner for effective heal, severely reduced healing is available for use on minions.
undodgeable (procs on hit), no need for interaction with enemy laner, full heal is available on anything he Qs.
technically shouldn't be on the list, but most definitely worth mentioning. His healing is 100% bullshit and relies merely on being somewhat near things that die (regardless of whether he damages or kills said things). Were he not on the weak side, people wouldn't turn a blind eye. Thankfully, trundle is a troll pick right now (LUL).
undodgeable (procs on hit every 3rd auto), no need for interaction with enemy laner, full heal is available on anything he auto attacks.
dodgeable, must interact with enemy laner for heal by hitting a tentacle slam. Missing % (Strong at low hp and non existent at high hp).
Conclusion: the healthiest methods of healing would logically seem to be the ones that mandate or at least incline champions towards interacting with the enemy laner. Champions like akali and maokai prove incredibly frustrating as their sustain has very few drawbacks and no "Weaknesses" in the sense that they don't have to land a skill shot or have to attack an enemy champion to gain access to the full heal. Chogath left out (I got lazy). Nasus is bareable only in the sense that his healing is tied to his damage, and his damage early game is rather pitiful. Post sheen however his sustain methods are just as unhealthy as akali and maokai's.