I need a Logo and complete branding. Social Media, business cards, sign for above the physical store, etc. -- 2

I am preparing to open a computer repair and modification shop. I will have a physical location as well as offering items and services for sale online. The name of the store is Mr J Computer Repair and Mod. Everything has a Joker theme. I do a lot of custom art for customers mostly with my laser engraver. I have a realistic style and would like my branding to reflect that. I have been unable to design my brand to my own expectations and i have yet to find anyone to create something that i am willing to commit to using. I will share the computer that will be the centerpiece of the store itself. I am also hoping to find someone who understands and matches my art style to work with me on designs for customers going forward. I do not want anything "cartoonish" in my branding. Please do not give me something with cartoon Joker on it. I have had too many of them already. I am completely open to color, (neon green and blacklight purple) but i would also like some things to look good in grayscale so that i can engrave them. I know that i am picky so i have described what i am looking for as well as i can. I truly hope that someone is able to help me. Thank you for your time. Sincerely, Mr J