AEFHIKLMNTVWXYZ drawn with straight lines
BCDGJOPQRSU not drawn with straight lines

147 drawn with straight lines
0235689 not drawn with straight lines

ABEHIKMNOTXZ resembles corresponding Greek letter
CDFGJLPQRSUVWY does not resemble corresponding Greek letter

BEJQXYZ no US state starting with this letter
DFGHLPRU - one US state starting with this letter
KSTV - two US states starting with this letter
CO - three US states starting with this letter
AIW - four US states starting with this letter
- five US states starting with this letter
- six US states starting with this letter
- seven US states starting with this letter
MN - eight US states starting with this letter

All answers assume a sans serif type font:

BDO no endpoint
P one endpoint
ACGIJLMNQRSUVWZ two endpoints
EFTY three endpoints
HKX four endpoints

CEFGHIJKLMNSTUVWXYZ no enclosed area
ADOPQR - one enclosed area (in some fonts, Q encloses two)
B - two enclosed areas

BCEGKMQSW prime numbers
DFHIJLNOPRTUVXYZ composites

Letters found on the eye chart

Letters that contain only curves

Letters that are Roman numerals

Letters with horizontal symmetry

Letters that can be drawn without taking a pen off of the paper

Capital letters that look like lower case

Letters with vertical symmetry

Letters which in Morse code consist of only dots, only dashes, or both.

Letters with vertical and horizontal symmetry

Letters that are dotted in lower case.

Letters that have ascenders or dots or descenders in lower case.
Letters that have ascenders or dots but not descenders in lower case.
Letters that have descenders but not ascenders or dots in lower case.
Letters that do not have ascenders or dots or descenders in lower case.