AD

Poke With your E, max it first if they poke a lot,

Only jump in if your tank goes first (or if you can leap out of their bush onto a minion in a safe location,

Use improved W over Q against tanks to out-last them,

Always jump on the scariest opponent (e.g. Yi > Soraka > Ashe > Nidalee > Sona)

AP

Before jumping on someone get 4 passive charges through using your E on enemies and your W on minions, use your q just before you jump and spam your W the moment you land in the middle of the enemy team (for maximum effect),

W heals so be sure to do that as much as possible,

If the enemy buys Banshee's then pop it with your E BEFORE you jump them,

much like the first comment be sure to get 4 points when you ult and follow the same procedure.

Tank

Your W gives defensive stats so use that when you leap in maximum disruption,

Use your E on the enemy with the highest damage output, this will scare them and cause them to retreat for a second or two (psychological threats)

Only go in if your team can follow / they have no lockdown cc to punish you with.

Don't worry about varying out the build depending on what you need.