The OT god is firmly monolatristic, other gods canonically exist. The NT god is after Judaism transitioned to monotheism, so god had to change from less “my dad will beat up your dad” to more “god is responsible for everything so he’s omnibenevolent but don’t think about it too hard.”

Depictions of YHWH are inconsistent from book to book in OT, and even within one book you sometimes get different pictures. You have to remember that these texts were composed over hundreds of years.