Featured Characters: Batman (Bruce Wayne) (Flashback and main story). Supporting Characters: Alfred Pennyworth (Flashback only). Commissioner Gordon. Harvey Bullock. Villains: Criminals. Other Characters: Lucius Fox (Flashback only). Locations: Gotham City.
Blackest Night was I think 55 to 60 pages in length (not counting ads) while most comics by DC are 22-24 pages in length (again, without the ads).