i have to agree with others here, i don't like how Onua uses Axl's body design. The reason is because that design is just does not work, basicly Axl's body design was made for a Nexo Knight character, and seeing the design here shows that it does not really work for other themes. If LEGO was going to make a System Onua with the Axl body type, they would most likely have made an alternate design for it, like how the Big figs have had different designs to them.
actually, Axl's body design is a bit similar to the Dogpound and Leatherhead big figs:
in that they use normal Minifigure legs but have a unique torso and arm design.
But anyway, i would suggest altering Onua's body design a little, not to much mind you, just doing some minor alterations to it like adding the grass that was in Onua's design ideas:
in a way similar to Mungus's fur:
"note: im not saying that Onua should be a big fig like Mungus, just that the grass should be placed in a manner similar to his fur, as in that its around the upper part of his torso, but still allowing him to be able to place a head on top of his body."