And "good" writing is not necessarily story first. I've even read more than once that characters make the story, not the other way around. My opinion on this is: it doesn't matter which idea came first; as long as in the end you developed both characters and plot. I come up with very abstract ideas first (like: I want to write a fantasy story in which everything goes wrong.) Plot and characters get created together while I work out a summary. Usually I also get very detailed ideas even at the very first stage (eg. a sentence a character should say, how the magical orb looks like,...) but I don't write them down yet. I've tried once to not write down the details until I had the whole summary, and that worked so well that I accept that as a rule now.
By the way, I've given up (for now) on the robot story. Right now, I'm working on a travel story with an ESTP hero. During some time he has an ENTP companion, but mostly he travels alone and chats up every stranger he meets. After his travels, the ESTP tells his adventures to a friend, who writes them down. The idea is to alternate between the travel stories of the ESTP, and the diary of the writer friend who gets into some problems because of these stories. I don't know the friend well enough yet, but I guess he's either an ISTJ or an ISFJ.