I'll take a look at your PC's if you guys would like, after I blow some dust off the old Character Builder.
For Rhun - I'd recommend at least a 16 strength as well. You'll get a lot more mileage out of it than Dex. In 4e, if you wear heavy armor you can't add Dex so it's not helping AC (unless you stick to Hide). My recommendation would be to to put the Racial bonus to STR, and you would likely be better off. Also, for your at-will powers, if you have two weapons I'd recommend Dual Strike as it lets you make 2 attacks at-will (although it has to be different targets). In 4e anyone can pick up two weapons, but only certain classes can make use of them to their fullest extent (rangers, fighters, and barbarians).
For your 4th level feat you selected focused expertise in Rapier, but there's no benefit to it as you already get the bonus from Weapon Expertise (Light Blade). The rest of the feats are solid. You also don't have any items right now. Per the DMG you get a level 3,4, & 5 magic item + 680 gp. A decent one for your offhand is Rhythm Blade, grants an additional +1 shield bonus to AC/Ref when in Offhand (level 3 item). Also, you need to select which background benefit you are selecting for it to work.
Mowgli - your PC reminds me a bit of Kalidrev's Lanharath from the LEB game. He isn't going to be surprised by anyone! Maybe we'll nickname you radar

Your gold seems a bit off though. You get 680 gp to start. I'd recommend a magic implement, perhaps either a Bard's Songblade, Harmonic Songblade, or Harsh Songblade? They function as implements for bard's and also nice to have a weapon just in case
Another potential suggestion is that Alertness may be a bit overkill as you'll have +15 to perception even without it and rolling twice you can expect to have approx. +5 bonus from that feature so realistically your average result will be 30 (and your passive one is 25). It'd free you up to grab a different feat if you wanted.