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Where did you see a gif?!
I haven't used one in more than 10 years. I'm not using "any" gif's for anything. As you suggested, I've only used jpg or png for many years, but I'm trying to use all webp now.
The current Avatar is a jpg. I was trying to use a webp for the 1 image I have in the design. But Helix doesn't support webp yet...go figure.
Look at the "inspect" and you'll see the current image "assigned" to my profile is a jpg = "/media/kunena/avatars/users/avatar671.jpg", which is an image I uploaded for my profile. It's assigned to my profile, but only the blue Avatar is displayed. It's something directly related to Kunena because the URL for the image is /secure.gravatar.com/......
As you suggested I'll disable Helix and JCE one at a time to see if either of them has any relationship to the problems.

I disabled JCE and that made no difference. I cleared the cache for my profile and that made no difference - at the same time I disabled JCE.
Even though I use Helix as my default template in the site, I'm using Cassiopeia for the template in Kunena. So there "should" be no problems. However, you would know better than I if Kunena is reading "something" from Helix, even though there is nothing about Helix that's used for Kunena.

I'm happy to provide you access to the site. It's in development - not live. If you see anywhere that I've got settings incorrect, let me know.

the URL for the image is /secure.gravatar.com/

In this case, if you have enabled the gravatar plugin, the avatar display does not work. You can use only either gravatar or avatars.
The avatar upload option should not be available, if you use gravatars. But that's another bug.

I'm happy to provide you access to the site. It's in development - not live. If you see anywhere that I've got settings incorrect, let me know.

You can use the confidential tags for the access data (padlock symbol in the editor), then is this info visible only to you and moderators here.

I have 2 sites that are both development sites. Here is the latest where I've tried to start from nothing installed but JCE and Kunena - Those work for both front and back ends.
Please look at the front end for the 1 post in SEO for Small Business - First Post. I've detailed what I found with that installation.

The site that's caused me so much grief is -
This site has JCE (which I have confirmed is "not" a problem for Kunena) and Helix installed. Thank you for all your help.
The reason this is so important is because I'm the administrator for a group in Alignable.com - www.alignable.com/groups/seo-for-small-business - with over 5,000 members. I'm trying to redesign my site and then mirror what I'm doing in my group. The forum is a critical part of the group. The template being very clean (no images) is part of SEO. I get 99% mobile page speed with that design, and the 3 colors overlapping in the background is SVG code that, normally, would cause even a desktop to load very slowly. My techniques are proven to get fast Web sites - as long as you're not using WordPress.

You said, "If you have enabled the gravatar plugin..." and I have it enabled (as I just now checked) in the site that's causing so many problems for me. THANK YOU! I just got the image to show up by disabling the plugin. But there are so many link errors that I'm still not even close to finding how to work around them.

In the Cassiopeia site, I have not enabled that plugin. So why does uploading an image "not" work in this site?
If I can get that working I think I can get by with any of the bugs or issues by not using Helix, which is going to be a pain, but I'll make it work.
The links (which are not in the menu) work much better in this site. I'd even say there are none that do not work. But the log in form has to be disabled, and I don't have a problem with that.

I've visited both pages. General is the routing problem the same on both pages, but you see this error more stark with the template Helius.
github.com/joomla/joomla-cms/issues/35463
The route refers to the Joomla menu item Home and this is what causes these errors. 

Until the problem is fixed, I have only one way out for you. While setting up Kunena, use this as the main home page (mark the first menu item "Forum" in the Kunena menu with the star). Then you can also enable the login module again.
This is only a workaround during the setting of Kunena.

You didn't mention the problem with uploading an image for the Avatar. Is that also part of the routing issue? Or is there a fix that I've not found for that?

I had read about the issues with the routing in J4 a couple of weeks ago. Too bad they aren't making that a priority to fix. Maybe it's in the "next" update.

I'd be happy to disable the Joomla log in form, but the log in form for Kunena on the "home" page of the forum does not work due to the navbar not appearing normally. It's only about 10px in height. But on all other pages of the forum, the menu and log in form are fine.
On forum-home URL, the navbar is only 10 to 15px high, so nothing is displayed but the words "Log In", although the link doesn't work.
On form/index-en-gb URL, the navbar is properly functional and displays everything perfectly.
That doesn't seem like a routing issue, but you'd know better than I.
I tried in the third site (with the purple color) to increase the height with CSS but was not successful. I'll try again in the Cassiopeia site.

When you have a second, take a look at the Cassiopeia pages and tell me if I understood the "home" menu as you described - schoolfortheblonde.com/tagnew/forum-home

In the meantime, I'm going to build the site (again) using Cassiopeia only. It's amazing to what lengths we'll go to develop a site.
Thank you.