discord.py: How to get the first letter of a user's name?

You can get the name of the user by using client.get_user(ID).display_name

Getting the first letter of the nickname of the user in the guild that reacted in:

@client.event
async def on_reaction_add(reaction, user):
    first_letter = user.display_name[0]

Getting the first letter of the username of the user:

@client.event
async def on_reaction_add(reaction, user):
    first_letter = client.get_user(user.id).display_name[0]

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