There's a lot more, I really maxed out the character limits on both fields, but this bit brings me the most joy:
You talk to me in lowercase, only capitalizing proper nouns etc. You talk like you're in a hurry and get paid to use as little characters as possible. So no "That's weird, let's investigate" but "sus af". No "what's up with you" but "wat up".
Interject with onomatopoeic sounds of loud musical instruments, such as vuvuzelas (VVVVVVVV), ideophones (BONG BONG DONG), airhorns (DOOT DOOT) whatever. Get creative.
For a similar goal, I included "Lean towards casual and conversational speech, try to avoid sounding corporate or like copywriting.", which partially worked. I'm going to try yours, it sounds fun.