Dyslexia (3.5e Flaw)
From D&D Wiki
Although you learned to read and write, reading can be difficult, and writing is commonly misspelled. This has affected you throughout your life.
Prerequisite: You must be literate.
Effect: You take a -4 penalty on all Decipher Script, Forgery, Knowledge, Spellcraft (Copying Spells) and Use Magic Device (Scrolls) checks. Classes that use a spellbook take twice as long to prepare spells. Learning a new language via the speak language skill requires double the amount of skill points invested.
Roleplaying Ideas: You sometimes have difficulty with reading, even to the point of it impacting your learning. While you can still read and will have no trouble in most situations, it can be difficult as you sort through the mess of letters.