Yeah lol, I bought Tahm, won my first 2 games and did well despite my ping being 250+ ms cause of my brother hogging the damn bandwith on his phone running so much apps, and probably downloading shit. Cause of him, I have went from playing with high level golds and silvers down to bronze... lol.
I still love Riven the best tho for jungle. Rush in and knock someone up, then stun them, and probably execute with your ult, or first rush in with your ult, knock up, stun, then execute. (Usually don't start with the ult just incase they instant flash or use escape tools).
Anyhow, can't go wrong with a snowball champ like Riven. Probably the best mobility in the game arguably. Can get away from anyone almost.
Right now, Vi might overthrow that spot lol, Vi is pretty cool, her ult is insane since you can just use it and go right in to whatever target that needs to be focused and knock them up for like a second and slam em.