I know it can be kind of intimidating to see so many artists pouring a lot of detail into their work, but its also not a bad move to try to go for something simple and Immediately recognizable as well. Like @mdaven_art Explained, its easy to get caught up in details.
give some examples of characters you feel aren't forgettable and predictable
What helps me to try to think of a "Memorable" character is to think of a pretend franchise for them to exist in. I think, "Is this a character for children, teens, or adults?"
Consider:
A character intended for children should be easy to draw, and remember. They're cute and empathetic. (Example: the Character cast of steven universe. And even more memorable, Pikachu.)
A character made for teenagers should be relateable, more realistic but not jam-packed with details. They should also be teens themselves. (Avatar, Teen Titans, and most anime)
A character made for adults can be really hard to nail down in a few words, but they usually aren't afraid to be ugly. Most adult cartoons have really ugly characters, but that's a key thing to consider. You can remember an ugly face because they have unique features. (I hate to drag them like this, but Roadhog and Junkrat are pretty ugly but they are memorable. their ugliness is part of why a lot of people love them)
Lastly, find a theme to draw your character with. An example of a character with a theme would be Yugi from Yu-gi-oh. He's composed of primary colors, sharp angles, and Ancient Egyptian aesthetics. Its so hard to Forget yugi because of his hair! He's Iconic.
Sorry I went on a big 'ol speech, but I feel like this advice might help gain a better understanding of what a "memorable" character is.
TLDR:
Make up a "Target audience"
Pick a few themes you like, think of a character based on the themes
Create that character with the intention that someone can describe them without actually naming that character. If someone likes your character, but doesn't know their name, they can go to google and type in "Bald kid with blue arrow on his head "
Anyway, i've had like, 0 sleep so if this is all in a foreign language I apologize.
Hope this helps!