Wyll is portrayed as a good swordsman and a likeky candidate for the Pact of the Blade. He even gets free proficiency with rapiers. Yet his stats make him very poorly suited to being a frontline Warlock.
I would redistribute his stats like this;
Str - 9
Dex - 15
Con - 14
Int - 11
Wis- 13
Cha - 16
This would let him remain a useful caster early on, while giving us the option of making him go more martial at lvl 4 with medium armor and 16 dex.
