Get your ‘I’ right
A ‘crossbar I’ is the letter ‘I’ with bars (serifs) across the top and bottom, and in comic lettering this should only be used for first person singular. Most professional comic fonts also include a non-crossbar (sans serif) I, for use in every other instance (although it’s fine to use a crossbar I for the first letter of a noun). Usually the uppercase letter I is a crossbar I, and the lowercase is the non-crossbar. For those in the industry, nothing gives away the inexperience of the letterer faster than the incorrect use of crossbar I.