Responsibility for reports

I am fairly new to EBS. I apologize if I post it in the wrong forum.  I have a person who always does reports. For operations access in manufacturing, inventory, purchasing, sales order, payable, projects, which seeded responsibility would be appropriate? Just user level, or needs to be in manager or super user level? He does not need write access or should not be changing anything.

In addition, is there a document out there on how to create custom responsibility with read only access? Please advice. Thank you very much.