Artist's commentary
Among us Ivy Leaguers, Penn's got kind of a reputation. Yes, you know the one, the lightbulb joke one. A bit of that inside joke sort of crept into Pennsy's personality design, and I want to communicate here that I love both U. Penn and the State of Pennsylvania very much, and apologize for any offense I may have caused.
Pennsy, personality-wise, is probably someone you don't want to get on your bad side. Fiercely protective of her sisters with an extremely sharp tongue to match, she's got a temper and lack the willingness to forgive and forget. Forgive, maybe, but she definitely isn't the type to forget any time soon. Compound that with a bit of (rightfully deserved, perhaps) ego, and you can see why the commander might find handling her a bit thorny.
In the world of Pacific, each ship-girl typically appears with a few of her fairies ready to assist her in her endeavors. If an especially compatible young officer is found, he or she may be assigned to the ship girl in question as a permanent advisor/commander. The exact nature of why a bond is important is up to debate, but researchers operating underneath STEC's authority believe it has something to do with the nature of the ship girls themselves....
Given that each ship girl is unique in each instance of a world within Pacific's world design, finding an appropriately matched admiral is like finding a needle in a haystack. Finding someone who'd be able to tolerate Pennsy's temper for long enough for them to see her softer side...
Let's just say, STEC high command considers it a successful month if nothing explosive occurs within her naval bases. :)