Planning: Enumerate the attributes you'd incorporate for each friend. Decide upon a primary key that uniquely identifies each individual.

Design & Develop: Craft an intricate ERD encapsulating your data. This visual model should portray data tables representing your friends $(3$ to $5$ friends$)$ with connecting lines elucidating relationships. Note what attributes would you include for each person? Which attribute would you use as the primary key? In this part your job is to also create an entity relationship diagram or ERD, to provide me with a visual model of your database schema for the data and attributes of your selected friends. Your ERD should show your data tables of your friends as boxes, with connecting lines representing any relationships between them.