There's also Monica to increase Demon Crystal (trading post currency) drop rate and Robert to increase alcohol (mens' trust (affection) items) drop rate, but yeah, that's it.
There is also an issue of silver units needed to Class Evolution to take into account. Sometimes it is better to Evolve three Gold units than one Platinum (as Golds (and Silvers) eat one Silver, while Plats and blacks eat three).
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Hmm, if you spent too many Silvers that way, you might want to consider rerolling an account. Irons (nameless fodder) and Bronzes (named fodders, who despite that can see some use for their cheaper cost) are okay to burn, that's their purpose in life after all, but Silvers are just too precious in the beginning.
50CC30 means Unit has ben raised to level 50 and then Class Evolved (CC for short, for historical reasons. This feature was called Class Change in ithe original, Japanese,, version of Aigis) - this resets unit level back to 1 - and then raised back to level 30.
While you can Class Evolve as early as at unit level 30, for any unit you are going to use you should not do that straight away. First you should raise that unit to level 50 and then CC it to get dat tasty parameter increases from dat extra 20 levels.