Riven

Strengths

Riven's Broken Wings locks onto the champion your cursor is over at the time of cast. If you want to move past your opponent, make sure that your cursor is past your opponent as well.
Riven lacks a source of healing or strong defense and must compensate with burst combos. Lead into fights with Broken Wings and Ki Burst, while using Valor to escape and absorb counter-harass.

Passive · Runic Blade — Riven's abilities charge her blade, and her basic attacks expend charges to deal an additional damage.
Q · Broken Wings — Riven lashes out in a series of strikes. This ability can be reactivated three times in a short time frame with the third hit knocking back nearby enemies.
W · Ki Burst — Riven emits a Ki Burst, damaging and stunning nearby enemies.
E · Valor — Riven steps forward a short distance and blocks incoming damage.
Ultimate · Blade of the Exile — Riven empowers her keepsake weapon with energy, and gains Attack Damage and Range. During this time, she also gains the ability to use Wind Slash, a powerful ranged attack, once.

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