Rikimaru is the first ever hero i picked in my entire life. He is also the first ever hero I used that I owned so much. For Riki, I get boots/tango/flask, I then upgrade boots to pt, so he attacks so much more faster.^^ After that I stay in the lane and let my teammates gank and push, because riki has the advantage of being permanently invisible( sort of ), the enemy dont bother trying to kill me since they know they cant kill me and is a waste of their time. After I am able to farm, I usually get a butterfly and after that I can take on even the most tough heroes.( blink, smoke, atack 4 times, blink, dedz )^^.
But for competitive games, Riki should get diffusal blade since its a lot more easier to build up than butterfly, and the purge will help you in ganks. ( blink, purge/smoke, smoke/purge, atack 4 times, blink, ownage) ^+^
core items for low level games like garena: pt, butterfly
core items for high level games: pt, diffusal
please check my dragon, help it grow a lot faster!!!