Annie

Strengths

Storing a stun for use with her ultimate can turn the tide of a team fight.
Striking killing blows on minions with Disintegrate enables Annie to farm extremely well early in the game.
Molten Shield is a good spell to cast to work up to Annie's stun, so sometimes it's beneficial to grab at least 1 rank in it early.

Passive · Pyromania — After casting 4 spells, Annie's next offensive spell will stun the target. Annie begins the game and respawns with Pyromania available.
Q · Disintegrate — Annie hurls a Mana infused fireball, dealing damage and refunding the Mana cost if it destroys the target.
W · Incinerate — Annie casts a blazing cone of fire, dealing damage to all enemies in the area.
E · Molten Shield — Grants Annie or an ally a shield, a burst of Move Speed, and damages enemies who strike her with attacks or spells.
Ultimate · Summon: Tibbers — Annie wills her bear Tibbers to life, dealing damage to units in the area. Tibbers can attack and also burns enemies that stand near him.

A suggested 5-lane lineup built around Annie, based on hero partnerships and role synergy — not win rate.