I used to be a little overweight when I was a few years younger. It is not very healthy.
No, I would imagine that it's not.  What is the best way to lose weight?
Losing weight and being healthy is all about calories in vs calories out. Having more fat than is optimal is not worth it.
Is there any type of fat that is good for you?  Maybe like avocados?
Certain fats are definitely better, like avocados are a lot healthier than greasy meat. Though that is more about health than being overweight.