Fave character: Beelzebub (pronounced Bill Zee Boob).
A powerful extremely rich politician who practically solves everybody's problems with money network and influence. best friend and rival of the world's strongest character, our protagonist.
She is also, very nice. Like, it's almost refreshing to see nothing sinister about such a character. She seems to genuinely, have people's interest at heart and although she can be brutally honest and pragmatic, it's just because she doesn't like nonsense nor pretense.
Our MC, who owns a cabin in the woods and lives off a modest (okay let's be real, that is actually middle to upper class) income with two daughters and four other freeloaders, regularly asks Beelzebub for help whenever she finds a problem she can't just literally magic away.
So far, I'm...very okay with the series. Definitely not something I'd recommend anybody for but...if you're into boring chill relaxing and forgettable background anime that doesn't fight for your attention then yeah, 300 years killing Slime.