The Changeling brings stealth to a whole new level, and can utterly confound unsuspecting enemies.
This is a pretty wacky concept, but bear with me and let me know what you think!
The changeling behaves in many distinctly different ways from other heroes. First, upon entering a quick match game, the Changeling takes on the appearance of a random enemy hero, this includes the loading screen portrait that enemies can see. They will also appear as that hero on the in-game scoreboard until vision is gained on it by the enemy while it is in its natural form (it spawns as a changeling in the nexus). Allies can see the changeling's portrait in the loading screen and scoreboards at all times.
TRANSFORM BENEFITS
Mimicking an enemy will give you the following characteristics
You gain the use of their un-talented basic abilities and trait
Your HP remains the same, however the appearance of the HP bar in game will change to mimic the target hero
Your heroic may also affect your trait
DISGUISE BENEFITS
These benefits are only given while you are not REVEALED as the changeling
Enemy heroes cannot target you automatically (i.e. attack-moving or skillshot abilities)
Enemy minions and structures (except the core) will not attack you
Allied minions and structures WILL attack you
You can walk through enemy gates
You cannot use enemy healing fountains
Enemy AoE healing will not affect you
Enemy targeted healing will heal you for 50% of the normal value, but also reveal you
Enemy AoE damage will deal 50% damage to you (once), but reveal you
Your heroic may give you different disguised benefits
NOTE: Mimic mode
using your E ability (or 3) will change you from disguise mode to mimic mode. In mimic mode you remain allied to your team and AI, and allow you to transform into an allied hero. Taking damage in this mode will not reveal you to the enemy, however dying with result in changeling giblets, alerting the enemy to the presence of a changeling in the game
REVEAL CONDITIONS
unless otherwise noted by a talent or ability, the changeling will be revealed to the enemy by under the following circumstances
Damaged by an enemy AoE ability
Healed by an enemy targeted healing ability
Attacking an enemy while disguised
Attacked directly with A-click by an enemy
REVERT CONDITIONS
the following circumstances cause the changeling to revert to its natural form
Using a changeling ability
Hit by an attack from the enemy core
Heroes that cannot be mimicked
The Lost Vikings
Abathur
Murky
Cho'Gall
While disguised as an enemy, the Changeling's normal Q-E abilities are instead placed on the 1-3 buttons, using ability 1 or 2 reverts the changeling to its natural form. Enemy abilities that reveal cloaked units such as Tassadar's Oracle do not automatically reveal you, but instead give you a slightly purple-goopy aura for the duration of the reveal.
Could you add a simple table as to what reveals and damages it under what circumstances so it would be easier for others to understand