For the best read, I recommend the Times New Roman font and a Medium Dark background. As for size, I only ever use Normal and don't know what the other options look like so that's up to thou :)
I tried indenting the paragraphs at one point but I didn't really like it lol, so I chose to stick with what I gots.
Also, if you've already read the original Mona Lisa from Halo Evolutions Vol II and/or seen the motion comic on Halo Waypoint or on Youtube some place; that certainly helps with the experience of reading this stuff.
I will post a list of MLP characters in order of importance, as well as the characters from the original Mona Lisa who they will be replacing. If you'd rather find out for yourself, don't scroll down any further.
List of characters in order of importance (10=really important. 0=not really important):
10 Princess Luna/Nightmare Moon - Lopez
10 Rarity - Benti
9 Princess Celestia - Commander Foucault
9 Rainbow Dash - Burgundy
8 Derpy - MacRaw
8 Discord - AI Rebecca
8 Big Mac - Clarence
8 The Great and Powerful Trixie - John Smith
8 Gilda - Henry
7 Spike - Rimmer
7 Twilight Sparkle - Orlav
6 Lightening Dust - John Doe
6 Zebra Zecora - Mahmoud
6 Pinkie Pie - Tsardikos
6 Fluttershy - Gersten
6 Applejack - Singh
5 Fleur De Lis - Percy
5 Lyra - Rakesh
4 Octavia - Simmons
4 Vinyl Scratch - Sydney
3 Snowflake - Cranker
3 Thunderlane - Maller
3 Cheerlie - Ayad
2 Bon Bon - Rabbit
1 Dr Whooves - Helmsman
0 Princess Cadence - AI Chauncey
0 Spitfire - Sergeant Fugasi
0 Brea Burn - Guard named Murray
0 Carrot Cake - Prisoner blood graffiti
0 Daring Do - Book title
0 The Flim Flam Brothers - Cider brand