This is how i would Buff Races & Birthsigns in TESVI :

High Elves :
>+100 Magicka, 75% Disease Resistance
>Racial Daily Power is Highborn which doubles Magicka Regen for 30 seconds
Bretons :
>+50 Magicka, 25% Magic Resistance
>Racial Daily Power is Dragonskin which Absorbs 50% Magicka from spells for 30 seconds
Dark Elves :
>50% Fire Resistance
>Has two Racial abilities which share daily cooldown, Fire Shield which grants Fire Immunity and deals scaled damage for +5 your level for 30 seconds, and Summon Ancestral Specter for 30 seconds which is also scaled by +5 your level. He makes little damage but is very tanky and distract or tangle enemies
Wood Elf
>75% Poison & Disease Resistance
>Racial Daily Power is Nature's Friend which scales by +5 your level to make an Animal / Woodland Creature as your companion for 120 seconds after it will remain docile against you for 120 seconds
Nord
>50% Frost Resistance, +50 health
>Racial Daily Power is Woad which decreases all damage taken by 50% or 30 seconds
Redguard
>50% Poison & Disease Resistance, +50 Stamina, Also has Alik'r Training which boost all melee weapon damage by 1%. Doesn't affect Spells, Bows or Unarmed
>Racial Daily Power is Adrenaline Rush so this would have two effects depending how the game would play out. Main Effect is 100% Stamina Regen, but also slows time by 50% for 10 seconds. Depends how Slow Time is handled in VI


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