Saltatio - New Champion

Well, this is still a WIP. First off, one quick note to get out of the way: This is my first champion. I will have some trouble with the units in League and with damage scaling. Help me out.

Anyways, here's the general idea for this character:

Saltatio is a sustained, AP mage designed to quickly dart around the battlefield while still dishing out plenty of damage. His kit and lore are based on dancing. Yes, dancing.

Currently, I do not have lore (I did say it was a WIP >.>), however I'm thinking that Saltatio will be an Ionian. Enough about unfinished lore, here are my current ideas for his kit:

Passive: Fluid Steps

Saltatio gains movespeed equal to (.08%) of his AP. In addition, he gains AP equal to (.12%) of his movespeed. These bonuses do not stack each other.

Q: Squaredance Cost: 50 / 65 / 80 / 95 / 110 mana Cooldown: 14 / 12 / 10 / 8 / 6 seconds

Saltatio dashes forward 600 units, and then dashes to the right 600 units, dealing 100/140/180/220/260 + (60% AP) each time

W: Hollowback Cost: 50 mana Cooldown: 10 seconds

Saltatio readies himself for 1.5 seconds. During this time, if Saltatio would be hit by a projectile, he instead dodges it, then dashes 600 units in the direction of the champion who cast it.

E: Slide Cost: 50 / 60 / 70 / 80 / 90 mana Cooldown: 12 / 11 / 10 / 9 / 8 seconds

Saltatio dashes forward 400 units, dealing 80/100/120/140/160 + (70% AP), and then strikes a pose for .5 seconds, stunning himself

R: Let's Dance! Cost: 120 / 140 / 160 mana Cooldown: 100 / 90 / 80 seconds

Saltatio dashes forward for a total range of 1000 units, and grabs the first enemy champion hit. He then suppresses both himself and the enemy, and begins to dance with them for 1.5/2/2.5 seconds, dealing 200/250/300 + (90% AP)

Ok, before you post some questions, here is the reasoning behind a few of my choices:

1) What are his weaknesses? Mainly CC. Once he is caught, he's a sitting duck.

2) Strengths? Very strong against champions who try to stay back a distance and poke

3) What are you thinking with that duration of suppression? Are you insane? First of all, the important fact to remember is that, during this 'suppression', Saltatio and the enemy champion are dancing. They are moving around the map. This makes skillshots more difficult to land. In addition, Saltatio is also putting himself at great risk, because he can be hit during the suppression as well.

4) That looks like a lot of damage coming from one champ. Isn't that OP? Perhaps. As I stated at the beginning, I am new to making a champion, so the numbers might be off. However, keep in mind that Saltatio always dashes. He has no targeted abilities. As such, it will be easier for enemies to dodge his abilities.

5) What the heck is with his name? Saltatio means 'dance' in Latin. I thought it fitting.

6)#WarwickRehash The only thing in this kit that is close to Warwick is Saltatio's ultimate, and even that is fundamentally different. Yes, they both suppress, but so does

Anyways, any help is appreciated. Thanks in advance!