Robin and Grayson from the Batman cartoon, weight around 1- 0.9. This lora has issues with producing artifacts for anything for black Yes, I know I have mentioned this issue several times already, It can probably be fixed with HireFix and good negative prompt,

When generating Robin's costume, do not use the main trigger, just the basic prompt.

edit ; it feels to late say it, have to mention lora does poor job generating image of robin costume, it is good lora for generating images grayson, but not so much for robin,you can still get some what decent result, with using score in your prompt , don't aspect so much thought