[quote=JandK]Wyll does get an extra proficiency in Rapier, yes.
And yes. Wyll shouldn't have Rapier proficiency. I honestly thought he was Pact of the Blade because of his rapier. With that pact, the warlock has a blade that resembles whatever; something like a rapier would be a natural fit for someone with high Dex. The pact means he's proficient with it, and it's magical when determining resistance and such.
And, he's supposed to be the Blade of Frontiers, so it would make sense that he'd have that pact. At level 5, gain Thirsting Blade and get an extra attack with his summoned rapier.
But, instead, they give him Rapier proficiency. Weird to me.
I think (hope) it's just a placeholder since Pact of the Blade isn't implemented yet.
Wyll's stats do not support blade pact warlock. He is okay as chain/tome, but that doesn't really fit his back story.
To make him "work" as written they need to have his patron give him +cha to attack and damage with the rapier in addition to the rest of the fiend kit. That would fit the story nicely, as his "deal with the devil" would give him real fighting prowess well beyond his actual abilities.
Player could then still patch his awful AC with the moderately armored feat at level 4.
Have Wyll's stats been customized by Larian yet? I think he's just using the default Warlock spread, which is Cha-focused. Shadowheart had a similar problem when she was originally str-specced with dex as her dumpt stat despite being a trickery cleric. If they made him a real pact of the blade presumably they'd swap his stats around (I'd go 16 dex, 15 cha, 14 con) to be melee-focused rather than relying so much on EB. Fiendlock is overshadowed by Hexblade (because Hexblade was something of an over-reaction), but they still make decently tanky fighters with a suite of tricks up their sleeves.