Half giant alignment restrictions. All in all, I don't mind them. In 2e giants WERE their alignment, the reason being their outlook and disposition was in line with the nature of their element and their god too. In 3e, like most things they added the word USUALLY/GENERALLY but the alignments were unchanged.
Surtr is LE, Surtr is the main god of fire giants, fire giants were LE, fire half giants are non chaotic
Stronmaus is CG, Stronmaus is the main god of the storm giants, storm giants were CG, storm half giants are non lawful
Obadai is TN, Obadai is the main god of stone giants, stone giants were TN, stone half giants have to be a flavor of neutral
Cloud giants is a weird one. In lore their main god is either Stronmaus or Memnor. Memnor is NE and is secretly conspiring to overthrow Annam as head of the Ordning, and thus in lore were NE following his trickster and ambition aspects and deceit, but the NG ones emphasized the positive side of his ambition or followed Stronmaus. Either way, cloud giants have to be a flavor of neutral and thus can be either NG or NE
Now Frost giants... is where it breaks. Thrym is CE, Thrym is the main god of frost giants being a god of strength and hunting and the more old school shamanistic wyrds and hexes. In 3e Surtr was a god of strength and the usual armored warrior visage and didn't have magic in his domain but did have law, and Thrym had magic in his portfolio and was ergo his contrast as the leather clad hunter wild and berserk.
The PROBLEM is... frost half giants are neutral only. They cannot be CE like Thrym is and are the exception in this versus all other half giants.
Ergo I would propose frost half giant be changed from neutral only to non-lawful. This would both amend the above, further emphasize the contrast between fire and frost giants that dates back to the earliest days of jotun lore where Surtr and Thrym were polar opposite twins vying for Annam's approval, and would likewise allow for CG frost half giants to contrast the LG fire half giants a la paladin vs liberator
As a side note, cloud half giant too would be more fitting if it was non neutral, AKA you had to be a flavor of good or evil but couldn't be CN/TN/LN, but this one is pedantic where as the frost point is more pertinent