You might be interested in a book by Dr. Ratey- “Shadow Syndromes”. It discusses how to tell when you have just enough of an additional disorder to have it mess with you.
Dyslexia, dyscalculia, and dysgraphia are so commonly associated with ADHD that they are often considered to be a part of the disorder. (Barkley, Attention Deficit Hyperactivity Disorder Second Edition, Guildford Press, 1998)
Common thinking is that Depression with ADHD is a result of being misunderstood for so many years. Sounds tragically correct for so many.
While OCD is a commonly considered co-morbid, we tend to not have the ritualistic behavior associations. It appears that our OCD springs from a need to “do what works” and is really more of a coping mechanism.
In general, the foundation of what appears to be ODD is really frustration. Our brains actually work faster and certainly differently so we are more prone to being frustrated. I just tell people that I have a low BS threshold.
Odd note- I don’t write, per se. I DRAW when I am writing. It would be interesting to hear what a handwriting analyst makes of my hand written thoughts.