Quick study tip.

Since getting into reading manga on a nearly daily basis, I've been
searching for ways to make note of unknown kanji/words in a way
that causes the least disturbance and not creating a big paper trail.

The best solution I could come up with was to use an invisible ink pen.
It allows you to circle words that you don't know without making any
marks on the page. Many pens today come with a built-in UV or black
light. Maybe only a few bucks at most if you look online.

So now I read manga, make note of these words, and then later on
go back and enter these into Anki.

What are some of your study tips/tricks that you use most often?

That's awesome. I didn't know such things existed. Are you sure you didn't just imagine invisible ink pens after watching Roger Rabbit? ;-)

Whoa, dang, that's an incredible idea! Very nice, indeed! I'll have to look into this.

That is a cool idea.

In text books I just highlight words/phrases I want to put in my SRS later. In manga, if I'm near my computer then I'll just put it straight in, otherwise it's a pencil, or those little post-it-notes, which then stick out the side of the book and remind me to put them in later.