Cevon

A quick mock-up of a champion kit.

Tidal Lock (P): Cevon's attack speed is locked at 1.5, and auto attacks cannot critically strike. Attack speed increases cleave Aoe, while critical chance increases cleave percent damage (100% crit = 250% cleave damage).

Rising Tides(Q): Cevon raises a wall of water from the ground, pushing enemies immediately in front of him away Twi: Cevon raises a pillar of water, knocking enemies up. La: Cevon Leaps briefly, carrying anyone stuck to his sword with him, and smashes the ground, knocking enemies up in an area.

Parting Seas(W): Twi: Cevon shoots out a blade of water in a line. Champions hit will be carried to the skill's max distance. If the champion hits terrain, Cevon can use Twi version of Rising Tides. La: Cevon dashes a short distance in a line, carrying the first champion along with him, knocking aside the rest. At the end of the dash, the enemy is pushed away with a gush of water. If they collide with terrain, Cevon can use La version of Rising Tides.

Twi/La(E):
Twi: Cevon's autoattacks will cleave enemies in a line, (yasuo q distance, not instantly). The first autoattack will deal 50% more damage and slow for 50% and steal armor and magic resist; debuff caps at -30% at 8 stacks, while buff stacks infintely, but falls off all at once after four seconds of not being refreshed. La: Cevon's autoattcks cleaves enemies in front of him. The first autoattack will deal 50% more damage and slow for 50% and steal ad and ap; debuff caps at -20%. Buff Stacks infinitely, but falls off all at once after four seconds of not being refreshed.

Raging Waves(R): Cevon summons a zone of angry waters in an area around him that damages enemies when they dash or flash (if they are still in the AoE). His spells and auto attacks gain lifesteal and spellvamp and healing effects are increased 20%. Units can walk anywhere on the waves.

The goal was a brawler type champion who excels in extended skirmishes. Workable early game, but lacks sustain until 6. Harassing with Twi in order to stack up resistances as they last hit, and then bum rushing them with Parting Waters and proceeding to shred their damage while stacking your own is the intended trade pattern. Not intended to be a support, but Twi knockback could save the adc from a Lee Sin hop, so there's that. I usually forget about writing lore for these kinds champ kit mock ups, but I kind of feel like doing one for this. As a jungler, ganks would work a little like Poppy's, but post 6, you can walk over terrain (at the cost of huge mana drain and 15-45s cooldowns).