Board Thread:Questions and Answers/@comment-26285368-20150805211311/@comment-4651179-20150805212642

Some time after its conception back in the 2000s, comics from the Ultimate imprint started using upper/lower case letters (the earliest example I could find is from Ultimate Spider-Man #14).

Using diffent fonts during Secret Wars could also help readers easily disguish when a character was from the Ultimate Universe or not, specially when the two versions of the same character were in the same room.