Mecha Karthus Champion Concept (slightly Updated)
Based on a Story I created between an Epic battle between Heimerdinger, Ziggs, Rumble, the Prototype Mechas, Creator Viktor and the Battlecast Army, I used it to create Prototype 42: Designation Karthus (AKA Mecha Karthus) so I could use it as a baseline for how Mecha Karthus's abilities work.
Part 1 : http://boards.na.leagueoflegends.com/en/c/fancreations/kt5gejwd-part-1-the-final-mechanical-stand Part 2: http://boards.na.leagueoflegends.com/en/c/fancreations/B5UI8EEb-part-2-a-final-mechanical-stand
(Please note that the Picture I've added in is very basic, so srry about that)
Passive - Death Defied: Instead of becoming a ghost, Mecha Karthus's body begins to break down into pieces. However during this time his Core Reactor overloads allowing him to cast his spells for 7 seconds before it implodes and he dies (for realsies)
Q - Lay Waste: When upgraded to lvl 1, a missle bay opens up on his back and a holographic targeting reticule appears on top of his staff. When activated, a missile shoots out of the missile bay and launches itself toward the cursor.
W - Wall of Pain: Mecha Karthus launches out a set of metal rods that project a holographic wall that will slow enemies. Enemies that travel through the wall will have holograms around them signalling that they've been slowed
E - Defile: Mecha Karthus powers up his core to a spinning electrical field at his center. The defile circle becomes a big spinning electric field. (I dunno, maybe something like what Nunu Bot has)
R - Requiem: Mecha karthus pushes a button on his arm console and lasers appear over each enemy's head (something like Karthus old R graphics)
Some quotes I thought of:
When pressing W:
"Enemy Movement Slowed considerably" "Escape is Futile" "Resistance is useless" "Activating Slow field!"
When Pressing E
"Electrical Field on" "Shock and Awe!" "Shocking, isn't it?"
When Pressing R
"Activate Protocol R" "Activate the R.E.Q.U.I.E.M. Cannon" "Death is Imminent" "Mutually Assured Destruction"
Below is an image showing a basic understanding what his abilities would look like. Feedback is appreciated! ESPECIALLY FROM A RED LOL :P