The phrase "character which" is correct and usable in written English.
You can use it to refer to a specific character within a group. For example, "The sheriff was the only character which displayed any genuine heroism."
It's their slightly noirish character which gives them edge.
There was a gentleness to Ratzinger's character which surprised me.
An unaltered, grounded character which renders him so appealing.
Contact angle measurements indicated that ZnO doped CSHH scaffolds have hydrophilic character, which stimulates cell attachment.
The space character is the only single character which does not follow these rules.
It is a clean, precise typeface with a contemporary character, which perfectly complements our identity.
Better still, it celebrates Eve's tenacious, challenging, and generous character, which made it all possible.
The character which is the ground of the predication will always remain obscure.
Cyclic voltammograms had broad peaks and suggested a pseudocapacitive character; which is common for titanate nanotubes.
This fallibility was compounded by an early misjudgment of his character which threatened to be catastrophic.
Hunnam apparently had his own ideas about the character, which were well received.
