I took the liberty of trying to 'reverse engineer' the Powerful Build racial talent available to half-giants in Psionics Unleashed. It came down to three points (feel free to debate with me over this, but I feel it's fair and it was, after all, a racial feat for humans in 3.5 Forgotten Realms). Using this as a model, I whipped up some half-giants with a more Norse flavor, hailing from Muspelheim, Niflheim, and Jotunheim, respectively. So here they are, with an outsider twist even.
Muspelborn
+2 Str, +2 Int, -2 Wis (strong and calculating, but foolish)
Powerful Build (3 pts)
Native Outsider (2 pts)
Standard Language Array (1 pt)
Elemental Resistance (Fire) 5 (1 pt)
Pyromaniac (2 pts)
Hatred: Humans and Dwarves (1 pt)
Born of the fire giants of Muspelheim, the Muspelborn long remember their battles with humans and dwarves. Their heritage runs in their veins more strongly than in their cousins.
Niflborn
+2 Str, +2 Wis, -2 Con (powerful and wise, but their ties to death weaken their bodies)
Powerful Build (3 pts)
Native Outsider (2 pts)
Standard Language Array (1 pt)
Elemental Resistance (Cold) 5 (1 pt)
Negative Energy Affinity (-1 pt)
Craftsman (1 pt)
Ancient Foe (Humans) (3 pts)
Niflheim is a chilling place, not only of the body but of the soul. Niflborn bear the scars of living beings born from such a place, but even as their life force slowly ebbs from their bodies, fires of ancient hatred are constantly stoked within their breasts.
Jotunborn
+2 Str, +2 Cha, -2 Dex (though born to rule their kin, they suffer their jotun parents’ clumsiness)
Powerful Build (3 pts)
Native Outsider (2 pts)
Standard Language Array (1 pt)
Fiendish Resistance (2 pts)
Fearless (1 pt)
Sprinter (1 pt)
Jotunborn descend from the rulers of the jotuns, and as such have mastery over their cousins' domains as well as their own. Always the first into battle, they lead by example, allowing no prejudices to get in the way of glory.