I don't think there's anything to be concerned about, if that's the implication. No one is obligated to create starkly contrasting and uniquely memorable characters time and time again. The most obvious case of cloning would be, well, a self-insert, but it's the environment that you put your character in and the other players with whom one interacts that will shape your character beyond whatever is the perceived typicality of their traits. You may even find that over time, your character is developing beyond what is stated in their initial profile from the different kinds of exposure.
But I suppose that, in actuality, is another topic.
Most people write characters that have traits the author can personally relate to, which makes it easier to write as that character. One may be making the "same" characters for that reason, and for those who are still learning how to create different characters of a more nuanced nature (as opposed to, say, writing characters that are complete opposites or nearly blatantly archetypal), it may be because it's hard to express something that may be difficult to observe in other people, especially if you are lacking in ways to properly convey it should you see it. Then it may just come off sounding like another character in which you confused a trait for that trait, and it's so on and so forth.
Otherwise, we write what we're comfortable with. I don't think I can analyze myself properly with how absolute the original question comes off to me, but I'll relate in a smaller scale than to say "all characters": I think for most of my "villainous" characters, I give them some degree of nihilism. Some sense of utter disregard for the life of man and the "bigger picture" when it becomes relevant, and some degree of a brooding quality in their dialogue, no matter if the tone is apathetic or carelessly lively. I think it's always there, just packaged differently. But it's a philosophy I like to explore, regardless.
The only other thing that would be consistent for all of my characters, maybe, would be some appreciation of dry humor. But no one can take their sense of humor out of their writing, nor is it some kind of handicap. Unless it's really bad puns.
But I suppose that, in actuality, is another topic.
Most people write characters that have traits the author can personally relate to, which makes it easier to write as that character. One may be making the "same" characters for that reason, and for those who are still learning how to create different characters of a more nuanced nature (as opposed to, say, writing characters that are complete opposites or nearly blatantly archetypal), it may be because it's hard to express something that may be difficult to observe in other people, especially if you are lacking in ways to properly convey it should you see it. Then it may just come off sounding like another character in which you confused a trait for that trait, and it's so on and so forth.
Otherwise, we write what we're comfortable with. I don't think I can analyze myself properly with how absolute the original question comes off to me, but I'll relate in a smaller scale than to say "all characters": I think for most of my "villainous" characters, I give them some degree of nihilism. Some sense of utter disregard for the life of man and the "bigger picture" when it becomes relevant, and some degree of a brooding quality in their dialogue, no matter if the tone is apathetic or carelessly lively. I think it's always there, just packaged differently. But it's a philosophy I like to explore, regardless.
The only other thing that would be consistent for all of my characters, maybe, would be some appreciation of dry humor. But no one can take their sense of humor out of their writing, nor is it some kind of handicap. Unless it's really bad puns.