The phrase "a character that allows" is correct and usable in written English.
It can be used when describing a specific character in a story, game, or software that provides a certain capability or function.
Example: "In the game, there is a character that allows players to unlock new abilities as they progress."
Alternatives: "a figure that enables" or "a persona that permits".
Marlinspike showed, for instance, how the character /, which appears in many Web addresses, can be substituted with an identical character that allows a data thief to substitute his or her own "secure" site.
He concludes that unlike concepts of physical science that have been analyzed by philosophers, the gene concept has a "nonessentialistic character that allows biologists to lay down different natural classifications, depending on the investigative methods available as well as on theoretical interests" (Weber 2005, p. 228).
It is the target demographic that explains that pitiful contrivance, "Joe the Plumber," a cartoon character that allows Republicans to say: "See, we have average working stiffs who love our anti-labor agenda".
Jaw muscles attach to the skull in the vicinity of the temporal opening, and it is an important character that allows us to identify living and fossil synapsids.
Wales may be regarded as the roundheads of Test rugby, a team only their mothers would love, but they have a depth of character that allows them to pull off the extraordinary.
He writes with refreshing admiration of the part of the American character that allows unfamiliar values to flower.
Its former name, Thick-billed Plover, alludes to the anatomical character that allows it to catch and manipulate hard-bodied crustacean prey.
For the reasons exposed in section II, the process of speciation will be much more likely to be triggered if the character that allows this colonisation is recessive, and hybridisation between the two groups would thus represent a much bigger threat for the members of the newly formed and less numerous group than for the ancestral stock.
Ability to form hyphae may have been an important character that allowed early oomycetes as well as early Fungi to poke, penetrate and explore to find terrestrial food that may have been patchy in its distribution.
His strength is in the character that allowed him to do that.
