Besides the four main characters, there are at least 13 side characters waiting to be introduced. The first four icons are part of them, who will appear in the “Overworld Arc” of the Askblog scenario. They are the ones the main characters encounter on their daily routine, either as a neighbor or as a colleague at work. For now, they are currently “locked”. Which means, they haven’t made any official appearance inside the story yet. Therefore you cannot ask any questions to them.
Depending on the questions, one of them might pop up in the main characters’ answer panel. Or, Zed might mention their names in one of his journal entries. That’s how they will be “unlocked”, up and ready for answering questions.
As for the bottom two, they will have to wait. I don’t know when I will let them loose, but I will hold onto them for a while. We all know who they are, and we all know that both of them are playing quite a huge role in the scenario.