I have an app ,using which I draw, OCs
I have OCs (orginal characters), using which, I roleplay.
In my native language we have two forms of which one for singular/one plural.
So... I'm not sure
If in english , too, there are two different words.
"which" is used for both singular and plural. There is no separate plural form. The same is true of "that".
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"which" is used for both singular and plural. There is no separate plural form. The same is true of "that".
seraph42I have an app, using which I draw, OCs
I have OCs, using which, I roleplay.
The commas after "draw" and "which" are incorrect, and should be deleted. However, even with this corrected, your sentences are probably not optimal for ever