These combos are optimal (doable online). I don`t post super duper fancy combos that are impossible online, because they are garbage.
Tremor Metallic: 21d4 -> db2 u, db2 u, njp, uppercut, EX dd4 47% 1 meter
Liu Kang flame fist: 113, b34, f44 -> bf2 31% no meter
Takeda Ronin: jump in punch, 44 -> EX bf2 -> run 44 -> df1 39% 1 meter
Jax Pumped Up: jump in punch -> 4 -> bf2 d, 11, b3 4 -> db2 41% corner no meter
Cassie brawler: jump in punch -> 242, run f21 ->db2, run f21 bf4 34% no meter
Quan Chi Warlock: jump in punch ->f2122, run, b23 -> bf3, jump in punch -> f212 -> df1 34% if i remember correctly, no meter
Shinnok Bone Shaper: jump in punch -> 221 -> db2 EX after third ball, run, jump in punch (opponent high in air), f22 1+3 -> bf3 34% one meter