New champion concept. (Riot, please look at this!)

Hello, world! I was just thinking about a new champion that could be added to the game. He would be a midlane mage, or a jungler. I can't think of a name, as I am not good at that sort of thing :-) It would mean a lot to me if a Rioter would look at this, and critique it.

He would be this sort of dark, evil shadowy presence, intent on controlling everything. He would also be a demon, which would be a core part of his kit.

Appearance:

Normal self: A shadow inclosed by robes, with spikes on the shoulders. You cannot see any of his face, except for his eyes, which are burning red. He has a red crystal suspended at his chest, attached by chains to his shoulders. He carries a staff with a similar crystal at the top. Color scheme: Red, black, gray.

True self: A demon, with wings sort of like Aatrox's, but the same shadowy face as his normal appearance. He would wear ripped, tattered robes that bear resemblance to his original self. He would retain the crystal chained to his body. I was thinking of something kind of like Ob Nixilis from MTG, but different.

Passive: The Demon Within

Whenever [insert good champion name here] hits a champion, large minion, or large monster with an ability, he gains a charge of The Demon within. When [insert good champion name here] reaches four charges, he ascends to his True Form, gaining bonus MS, healing himself, and empowering his next ability, to do bonus damage, based on AP. He reverts to his normal upon casting an ability.

Possible dialogue:

-I will show you... my true form!

Q: Mark of the Demon

Cost: 50/55/60/65/70 mana [insert good champion name here] sends out a ball of dark arcane energy in a straight line, dealing 60/95/140/175/210 damage. Targets hit by Mark of the Demon are marked with Dark Rite.

Cooldown: 10/8/6/4/2 seconds.

W: Whatever the Cost.

Cost: 100/110/120/130/140 mana

First cast: [insert good champion name here] creates a circle af dark arcane energy at a target location.

Second Cast: After two seconds, [insert good champion name here] can recast Whatever the Cost to pull himself to the targets, and drain up to three targets within the circle, prioritizing champions. Champions marked with Dark Rite are also slowed. Champions can break the drain by exiting the circle.

Third Cast; [insert good champion name here] can recast it for a third time to Fear all targets still in the circle.

Cooldown: 22/20/18/16/14 seconds.

Possible dialogue: Do you feel... the life draining from you? You will empower me! E: Cost: 40/45/50/55/60 mana

First Cast: [insert good champion name here] enshrouds himself in darkness, slowing his MS drastically, and taking 40/50/60/70/80% reduced damage.

Second Cast: The darkness evaporates, and [insert good champion name here] deals AOE damage around him. All enemies struck by this are feared.

Possible dialogue: -You cannot attack... what you cannot see. R: Shadow Rite

[insert good champion name here] ascends to his True Form, is rooted for three seconds, and disappears, reappearing at a target location, fearing all enemy champions in a radius, and establishing drain connections with up to three champions. Champions can break the drain by exiting the circle.

Possible Dialogue:

• Fear your true master!

Joke:

• Which came first... Demon, or man?

Taunt: -What... Are you afraid of the dark? -Join me, and we can rule the galaxy! (referencing Empire Strikes Back)

Special Notes: [insert good champion name here] shadow will always be the shadow of his True Form, even when not in that form.

Recall animation: [insert good champion name here] begins to slowly evaporate from the feet up into darkness.

In the comments, feel free to critique this idea, I am always up for suggestions!