Places made specifically for this:
The RP Repository
Welcome! - Charahub
Refsheet.net: Your Characters, Organized.
Toyhouse (meant for adoptables but has a good backbone for actual OCs)
Not for characters specifically, but also for worlds:
World Anvil Worldbuilding & RPG Campaign Management
Notebook.ai
For a content management system that you have full control over:
Wordpress (.org for installing on your own host, .com for a free limited service of the same)
Dokuwiki.org (must install on your own host)
This post lists a ton (Scroll down to "Apps" and start reading from there)
I started out on rprepository, moved from there to toyhou.se and my own wordpress install. They all worked well for a small amount of unconnected characters.
Eventually I wanted more of a wiki setup and decided wordpress wasn't for me. I moved to Dokuwiki and
this is my setup now, although to be fair it's evolved into more worldbuilding than character repository. (most developed section right now is the "Inner Demons" Canon, although everything is still a WIP)
Personally I think refsheet.net is the best looking pre-made solution for characters currently. I watch the dev on Twitter and she's released a ton of neat updates over the past year. If I hadn't already started my own solution, I'd probably be using that site.
Good luck.
EDIT:
In the off chance you're actually just looking for a web host, you can use wix or squarespace which both I think have free tiers. If you're thinking of paying for them or any other pre-made sites already listed, please note that if you have any technological aptitude/willingness to learn, it is
almost ALWAYS cheaper to host your own site and then put something on it. For example, toyhou.se, which doesn't let you have custom CSS unless you pay a subscription -- that subscription is more than I pay for my own webhost monthly. And I use it for more than just my character wiki. Installing things like wordpress and dokuwiki are free - so if all you are paying for is hosting then you have 100% control over whatever you want.
So keep this in mind if what you want is "simple" but the site asks for a subscription fee. By all means pay it if you like that specific site. But if you're frugal, hosting your own is probably the better choice.
So that said, Iwaku runs off atabyte so I feel it deserves being credited. But I personally use Nixihost.com