Disclaimer: I am not very knowledgeable nor experienced on this game, this post was done with help of the thread they linked below.
The answer to whether it's worth to level a HUnewearl depends on what you want from them. This is a game, it is meant for your enjoyment. If you want a different experience and play around with melee demons, melee spirits or melee magicks, go ahead and raise a HUnewearl. If you only have fun with the fastest times at doing quests, then just keep playing HUcaseal and use the Elly skin
If you call HUmar dumb, I'd call HUnewearl dumber. HUnewearl can use Lindcray and female gear, offers better team support in a party without forces and for solo she has Jellen and Zalure level 20 and slightly faster cast times and damage from slightly higher level techs, but she is worse in every other aspect.
I am curious to see the top-end damage-focused HUnewearl gear, but it will probably end up with stuff that HUcast or HUcaseal can use as well.