A moodboard will help enormously with this, which can be a mix of objects, people and more. Try this simple exercise...
List 5 films/TV s/he watches; 5 gadgets; 5 items of clothing; 5 places s/he's been to; 5 drinks/foods they like; 5 random further details (eg family, friends, quirks, talents, job...).
Now add any 3 images which represent their binary opposite (which might help start developing further characters + flag up things to avoid in costume, body language, mise-en-scene generally...)
NOW can you sum up the character in a couple of sentences?
SUGGESTED POST TITLE
NARRATIVE - visualising the characters [or a sep post for each main character]
FORMAT/PRESENTATION
A Ppt could be a convenient, quick way of doing this (1 heading, 5 images per slide), though adding images into a single Word doc without any accompanying text as an ADDITION would be simply smart - killing two birds with 1 stone, with apologies to our avian friends...
REFLECTING KNOWLEDGE/UNDERSTANDING OF THEORY
Note my brief usage/application of basic narrative theories above - the more you do this, the simpler such concepts will become for you. I only learnt them myself through repeated application!!!
THEORY CHALLENGE
Can you further apply more advanced theory like Hebdige's concept of subcultures, or (and these link together well!) Pierre Bourdieu's notion of cultural capital?
CHARACTER COMPARISON
As you review each set of answers, have a go at expressing the ideas as 1+ existing people/characters (eg the Mr Robot lead with a dash of Graham Norton - a brooding, ultra-talented (area?) individual with a camp side, fondness for pop culture as well as 'high culture'. Can you now create an additional moodboard?