... it's hard to pull off a certain look - specifically a black/silver color scheme - when every once in a while, the character pulls out and inspects this comically large golden-hilt dagger.

I think it's safe to say that people who use personalities want to pull off any number of potential outfits with any number of potential color schemes, and there are quite a few personalities that can't be used with certain aesthetics due to a random animation that plays while the character is idle. Some examples include the Assassin Blade of Woe fidgets, the Passion's Muse bright green flower summoning or occasional one-legged balance, and Worm Wizard's occasional blue magic tricks.

These animations shut out some potential character styles, such as...

1. A laid back, lover-not-a-fighter type of charming rogue using the Assassin personality's lean animations would look out of character when he suddenly whips out a weapon and inspects it.
2. Passion's Muse complements the Thief personality, with a more relaxed (but still keeping an eye out) version of Thief's "idle2", but suddenly, flashy flower trick or spontaneous flamingo.
3. As Divayth Fyr says, "sorcery is not necromancy". Not all creepy sorcerers use necromancy. Personally, it would throw off an Emperor Palpatine Sorcerer character I want to make.

Ideally, these random animations should be removed from the character's idle stance and be relegated to standalone emotes; most of them are already their own emotes and just require removal from the idle stance.

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Side note: Maniacal Jester didn't actually pull out the giant knife prior to the release of Update 40, so I'm not sure why that changed.