Top 5 Easiest (in my opinion)
Kenshi: Constant and easy to understand Zoning Game, plus a fortress of armor.
Sonya: Armor Cartwheel, and simple enough combos into standing resets.
Liu Kang: All in 1 character. Good Zoning, great rushdown, solid normals, and easy combos that Grant decent damage.
Cage: Aside from the obvious "3 and a dream" He also has great great tools for anybody wanting to learn MK9 and simple combos that end with Nut Punch for constant pressure.
Smoke: You don't need Resets to dominate with him (Even if it does help) D4 is ridiculous, B2, 3 is fast and easy to hit confirm for big damage and with smoke bomb your opponent is always cautious and never calm. Plus Shake is always helpful (As long as you remember you have that move)
@GGA Wafflez