This is my first build on mobaire.

Lulu burst and support is really nice so try it.

Pro:
-Shield
-Morph
-Speed increase
-Vision
-Slow

Con:
-Moves really slow
-Easy to miss click shield

Her items should be attack speed and a little ap.
Attack speed is for the slow she have on her Q.

Skills

Pix, Faerie Companion - Pix fires a barrage of 3 bolts, dealing 3 + (2 × level) magic damage each, at whomever Lulu attacks. These bolts are homing but can be blocked by other units.

Glitterlance - Lulu and Pix each fire a piercing bolt dealing magic damage, slowing enemies hit by 80% for a short duration. An enemy can only be damaged by one bolt.

Whimsy - On ally cast: Target ally gains 35% movement speed and bonus ability power for 5 seconds.
On enemy cast: Polymorphs an enemy champion for a short duration, disabling their ability to attack or cast spells and reducing their base movement speed by 60.

Help, Pix! - On ally cast: Commands Pix to jump to an ally and then follow and aid their attacks instead of Lulu's for 6 seconds. Upon arrival, Pix shields them for 6 seconds.
On enemy cast: Pix deals magic damage to target enemy unit. Pix then follows and grants vision of them for 6 seconds.

Wild Growth - Lulu enlarges her ally, knocking enemies away from them. For 7 seconds, her ally gains bonus health and slows nearby enemies for 1 second.

For Harrass Use your E on an minion or the enemy champion and then you have to use your Q on the enemy champion.

When you have harrassed enough you run in with Q - W - E - Q

When an enemy champions is attacking you in close range us R - W - Q - E - Q