Argyle King
Legend
Thought:
Why must ability scores be only from species or only from background?
Perhaps each Species could grant one fixed +1 and one semi-floating* +1.
On top of that, each background could grant a +1 that may be placed into one of three attributes.
*by semi-floating, I mean that each species could have two attributes that they typically (but not always) excel at. For example, dwarves are renowned for their Constitution, so the fixed +1 could go there. As well, dwarves are known for wisdom that comes from long lives and for an uncanny battle strength that defies their otherwise squat stature, so their semi-floating +1 could go to either Strength or Wisdom.
Dwarf: +1 Con; +1 to either Str or WIS
Then perhaps the town guard background might assume some minimum level of physical fitness (Str); experience in observing people and places (Wis); and
(I'm making this up as I'm typing it) let's say some reasoning for (Con).
With that in mind, character creation might look like this:
Dwarf +1 Con; +1 to either Str or Wis
Guard Background: +1 one of to Str, Con, or Wis
If you wanted to keep the idea of human versatility, humans could be the only species to have two freely floating +1s.
Half-Elves could be +1 Cha; +1 to any
Half-Orcs could be +1 Str; +1 to any
Why must ability scores be only from species or only from background?
Perhaps each Species could grant one fixed +1 and one semi-floating* +1.
On top of that, each background could grant a +1 that may be placed into one of three attributes.
*by semi-floating, I mean that each species could have two attributes that they typically (but not always) excel at. For example, dwarves are renowned for their Constitution, so the fixed +1 could go there. As well, dwarves are known for wisdom that comes from long lives and for an uncanny battle strength that defies their otherwise squat stature, so their semi-floating +1 could go to either Strength or Wisdom.
Dwarf: +1 Con; +1 to either Str or WIS
Then perhaps the town guard background might assume some minimum level of physical fitness (Str); experience in observing people and places (Wis); and

With that in mind, character creation might look like this:
Dwarf +1 Con; +1 to either Str or Wis
Guard Background: +1 one of to Str, Con, or Wis
If you wanted to keep the idea of human versatility, humans could be the only species to have two freely floating +1s.
Half-Elves could be +1 Cha; +1 to any
Half-Orcs could be +1 Str; +1 to any