CCO makes races and genders diverse again, each with their own strengths and weaknesses, so that each play through will be noticeably different.
Vanilla Skyrim allowed any starting character, regardless of race or gender, to excel at virtually anything, taking out the fun, strategy, and role-playing aspects of previous Elder Scrolls games from the overall Skyrim experience. Skyrim Redone, ACE Comprehensive Enhancements, Alternate Start - Live Another Life) and works with new characters and existing characters alike.
No more boring cookie-cutter characters-Choice matters again! Whereas vanilla Skyrim only provided you with 10 options for starting characters (excluding customizing their appearance), Character Creation Overhaul allows for 229,320 unique character combinations! Best of all, CCO is built for maximum compatibility with other mods (i.e. Character Creation Overhaul finally brings back birthsigns, classes, specializations, favored attributes, and major/minor skills to Skyrim.