I've actually pontificated Mina having a special stance where she can step towards and away from the opponent, much like Mitsu can with his RLC and MST stances. This new stance could specialize in fast, close-range attacks that offer spacing. Here's a list of the stance moves I've brainstormed:
ST-A She drops to a kneel to avoid high-level strikes and spins her weapon overhead, striking at high level twice with some quick blows that send the opponent reeling, much like her 22_88A, but faster, and producing greater spacing. Holding the A button will return to the stance afterward.
ST-B:B Mina shoves her weapon down at the opponents feet. On Just frame, she lifts it up the waste height. This hits on low, than at mid level. The second hit knocks the foe upwards and backwards, providing a small juggle, similar to Cassandra's 2B+K
ST-K Mina jumps to evade low-level attacks, and delivers a high front kick and a descending stomp kick in rapid succession, hitting at high then at mid level, so if the first hit is ducked, the second on will connect if the foe doesn't stand up in time.
ST-A+B She spins her weapon in front of herself, and it glows with GI properties. On successful impact, she repels the foe's attack and lunges forward, goring the foe in the diaphram region. She forces them to the ground and pulls the weapon out with a twist, resulting in a mid-level AT
ST-B+K She leaps upwards and comes down at a steep diagonal, offering slight range for a powerful mid attack. [B+K] makes this an UB attack, much faster than her present 9A+B. Even if less damaging, it'd more likely to connect.
I also think her 4A+B4A+B could be more smooth, with the second half coming out much quicker. Though Kilik's 4A+BBB is much slower, I find that it connects more often.
That's my take. Mina should still remain a character who excels at spacing and bashing the hell out of the soul guage, but giving her a stance for specialized up-close moves would definately increase her potential...