If You Could Redesign a Champion Without Worry
As in, you didn't need to worry about the kit being similar to other champions', worry about balance, worry about the champion's currently-established identity, etc., which champion would you redesign and what would it look like?
For instance, Malzahar heralds an inevitable invasion from the Void, so he'd specialize in sieging the enemy and making an inexorable advance. Toward that end, he'd lay down key emplacements, just like anybody who wanted to siege a fortress would need. So he'd open destructible Rifts to the Void that spewed out Voidlings (pretty much Zz'rot Portal, but bigger and more gratifying). In addition, his Malefic Visions would be more in line with Illaoi's E, when you become a Vessel (e.g., the landscape becomes distorted and monsters want to get you, which would be the Voidlings).
Try it.
reworked to be a manaless, skillshot only Touhou Boss
. Like you said: no hold barrels so it will seem incredibly broken.