I'm looking for a tag that can be applied to questions about letters/characters (such as How did the names of the letters in the English language come about, or Why do capital I's and small l's look the same with some fonts?)? Not sure if there is one already out there and I haven't seen it, or if it doesn't exist?
If you go to https://english.stackexchange.com/tags you can search for tags.
We do actually have a question Where did the names of English letters come from, and why are they all monosyllabic (except for "w")? which is treated as a duplicate of Pronunciation of the English alphabet.
Your question about the similarity of I and l in certain typefaces is not restricted to English and is off-topic. It might be on-topic on Graphic Design, but it's probably opinion-based.