Just made a champion kit, what do you think? (Most likely terrible)

Weapon of choice: Hand cannon that can also be used as a tonfa. P - When the hand cannon is on cooldown, the champion's auto attacks are melee with an empowered first auto and slightly increased attack speed. When the hand cannon is off cooldown, the champion uses ranged auto attacks. Q - Hand cannon charges up an empowered, explosive shot (displaying where the skill will go, like Taric's Dazzle) for a one second duration, then fires. If hit, it slows and resets E's cooldown. W - If in ranged form, attack speed is increased for 3 auto attacks. If in melee form, user gets movement speed and a shield. E - Swaps the user with minions/non-epic monsters/user's wards (being able to reposition allied pets and wards would be weird) R - The user charges his/her hand cannon, then dashes (very short range) to a targeted enemy champion and shoots point blank and then bashes them with the weapon. Forces the user's Q on cooldown. If Q was already used, ult cannot be used for a short duration. Used as an execute, damage is based on missing hp.

Mana costs are pretty high on Q and R. E is about a standard 40 mana.

A few combos: All in: Charging Q and then swapping with a minion right before it shoots to catch an enemy off guard. Followed with W to get a shield and movement speed with passive's empowered auto and attack speed, then ult to execute. Lane Trades: Auto, Q, E before Q shoots, E (if Q landed) back to safety.

I just typed this in 10 minutes, please be constructive. Some things (looking at the ult and W) could use some tweaks so that this wouldn't be OP. The lack of damage and mana costs included make this a bit harder to judge.