How to make a blacklist for $(touser)?

So, I’m trying to make a !KappaBlock command as a way to troll people who spam emotes. Ideally, I would “!KappaBlock @trollUser”, and this would filter that user’s posts through a blacklist containing the most popular emotes. However, I don’t know how to make this specialized blacklist, nor do I know how to add users to it. Is this dream command a possibility?

There is no sort of specialized blacklist that fits your description. It is very unlikely something like this would be added due to complexity and usability. You can have spam filters set to a set amount of emotes and have a set blacklist for everyone but nothing specialized as your describing.