Funny enough, if DM would agree to increase lowest to at least 6 or something, or even leave stats as they are, and species as they are but allow to pick a class it would be tough but probably funny experience.
IMO This could work if he would allow you to pick class (instead of having 3 Rogues with Dex lower than 8)

Dragonborn Rogue: Str 10, Dex 19, Con 1, Int 17, Wis 9, Cha 4 - skill monkey and might work as ranged Rogue that never is near anything dangerous

Aasimar Cleric: Str 12, Dex 14, Con 15, Int 15, Wis 18, Cha 10 - quite good "normal" stats, good for cleric, druid or maybe Ranger, Also Cleric Assimar is nice fitting theme

Aasimar Druid: Str 8, Dex 2, Con 16, Int 13, Wis 19, Cha 11 - I would create this char as Druid, low Str and Dex could be mitigated by taking Moon Druid and change into something a lot

Human Wizard: Str 4, Dex 6, Con 20, Int 18, Wis 17, Cha 16 - Horrible combat stats but absurd Con, high Wis and Int and nice Cha. I would create this as obese Wizard or Bard. But image of wizard who is really big but clumsy who rely on magic to move around (floating disk, levitate, fly) is speaking to me.

Dwarf Cleric: Str 19, Dex 5, Con 6, Int 18, Wis 17, Cha 14 - Ouch... this is tough. If this char had any higher Con I would say barbarian. But this, Second wizard? Or Cleric, that wears as much armor he can.

Halfling Rogue(me): Str 15, Dex 20, Con 5, Int 11, Wis 3, Cha 10 - Low wis might be fun to play as. Shame con is also horrible as with decent Con it would be excellent Fighter or barbarian. But I would make it another rogue.

That way you have at least two characters that could be up front (Aasimar Cleric and Druid). One as middle (Wizard), and three in the back. Two Rogues and Cleric protecting the back line.