Lol! Well Sona is generally played as a support character, meaning someone who buy lot's of wards and aura items, basically anything that helps the team as a whole. Octavia has all support items.
On the other hand a sort of trollsy Sona build that Vinyl has involves building her "carry" style. Her passive skill let's her do ridiculous amounts of damage early game, so that combined with damage items (Infinity Edge) and Sheen procs from the Trinity Force (doubles damage after using a skill) she can kill people quickly.
Yeah, thats true. I actually do find it pretty fun. I just feel like everyone judges me whenever I screw up. I have this guilty pleasure whenever I see someone else screw up worse then me. I sometimes think I'm secretly a bad person XD