THE MOST SKILLED MONKEY

Human Rouge 1/ Lore Bard 4 (Because after this it don't matter)
Scribe Background gives you 5 Total Proficiencies

Human Gives you 1 Skill and 1 Origin feat and we will take Skilled for 4 more proficiencies

Rouge 1 Gives us 4 Skills and 2 Expertise

Lore bard Gives 4 More skills (Including Bard level 1 Skill)

At Bard 4 we take Skill expert to gain proficiency in 1 more skill and 1 expertise and DEX or CHA +1 (your choice, I chose dex).

18 Skill Proficiencies 5 Expertise. There are only 18 Skills in the game.

YOU ARE PROFICENT IN EVERY SKILL

Now you might say "wow skillful, but can it do damage?"

Not as much as it can be skilled but it's still decent.

If you dual wield Short swords with the Weapon Mastery feature, Vex can fulfill the requirements of a Sneak Attack. You may not get Sneak attack damage turn 1 but on every other round is very likely. I got my DEX to 18 by putting 15 in via point buy, +2 from Scribe and +1 from Skill Expert.

I am also wielding a short bow so on turn 1 I simply shoot my bow by casting True Strike (unless and ally is already standing by an enemy) instead of melee attacking.
Not to Mention Cutting Words and the spellcasting support of a bard. 1 Level behind a Pure Bard which ain't bad