Yeah I don’t have a way to remove characters from the shopping list right now… I can put it on a list of things to add.
For now yeah, you could go into:
C:\Program Files (x86)\World of Warcraft\_retail_\WTF\Account\[your account name]\SavedVariables\AskMrRobot.lua
Open it with any text editor program, and search for the string ["Shopping2"]
(exactly like that with the brackets and quotes included). Under that you should see several sections like:
["Player-Server"] = {
["setups"] = {
["Frost"] = {
... stuff ...
},
... more stuff ...
["Blood Raid"] = {
},
["Unholy M+"] = {
},
},
},
You can delete that whole section for a player you don’t want to see anymore. Make sure to do this while WoW is completely closed, then start up the game again.