I have a temporary order against the abuser. Can s/he have or buy a gun?
The law says that anyone who has a court order against them that says that the abuser cannot contact, threaten, or physically abuse the petitioner cannot have, control, or transfer any gun or ammunition.1 The abuser will have to give any guns that s/he has to law enforcement to hold onto while the order is active or s/he could be charged with a misdemeanor.2 If you temporary order has these restrictions, then the abuser likely cannot have a gun.
However, if there is a good reason shown for the abuser to have a gun and the temporary order specifically allows possession of a firearm, then the abuser may be allowed to have a gun.1
1 Haw. Rev. Stat. § 134-7(f)
2 Haw. Rev. Stat. § 134-7(g)