Which buff would you give to an off-meta playstyle you like, to make it more popular and/or viable?

Try to suggest something that will not break or ruin their main role.

Three off meta playstyles I like are on-hit Lulu (machine gun Lulu), top/mid lane Kha'Zix, and AP Tristana. Here is how I would change them:

Lulu:

• Base attack speed and attack speed per level increased
• "Pix, Faerie Companion" now has a 10% bonus AD scaling (for a total of 30% bonus AD scaling if all 3 bolts hit)
• optional: "Pix, Faerie Companion" now counts as an on-hit effect. This affect things like Guinsoo's Rageblade.

The attack speed and bonus AD scaling buffs will not affect her main role which is support. A support Lulu never builds AD or attack speed. It might make her harass stronger early game if she takes AS runes, but it means she is forgoing runes that would be stronger otherwise, such as armor runes.

The bonus AD scaling is bonus AD instead of total AD because total AD means Pix would have to have its base damage nerfed, otherwise support Lulu's harass would be a lot stronger early in the game.

The on-hit effect change would mean Guinsoo's Rageblade would finally be a viable item for Lulu. It would also mean Lulu could transfer Pix to champions with Rageblade, making her a fantastic partner for champions like Jax, Kayle, Kog'Maw, or Master Yi.

Kha'Zix:

• "Void Spike"'s damage is also increased by 20% against minions, in addition to monsters.
• "Void Spike" refunds 50% of its mana cost if it kills an enemy. Doesn't stack if Kha'Zix kills multiple enemies.

Now as Kha'Zix, when going in lane, you have the option to max W if you want to have better waveclear. Waveclear is the major reason why Kha'Zix has issues going lane, and this change solves that, without buffing his ability to jungle.

The mana cost refund also allows Kha to not waste as much mana waveclearing if he decides to max it.

Tristana:

• "Rocket Jump"'s AP scaling increased.
• "Explosive Charge"': Passive's base damage significantly decreased. AP scaling increased. Now when "Explosive Charge" detonates, it applies the passive's damage against the main target only.
• optional: "Buster's Shot"'s AP scaling increased.

This changes means Explosive Charge is allowed to deal a small amount of magic damage against the enemy. This will not affect AD Tristana because she never builds AP. It might have a side effect of nerfing her waveclear early game, but this has the advantage of allowing her to better freeze a lane, and AD Tristana relies on Statikk or Hurricane to waveclear later in the game anyway.

The Rocket Jump change is obvious. Buster Shot might also have its AP scaling increased but 100% might be enough.