He's a bit of a character
Polite Irish for: he is very odd and you should keep an eye on him. Also: he's an interesting lad.
Yer man next door? Ah he's a bit of a character alright. He hoovers de lawn.
Shall I translate it into posh English for you, head?
Good afternoon, old bean. Here it is in posh English.
The gentleman next door? Indeed, he is something of an original. He vacuums the lawn.
Questions
What does he's a bit of a character mean in Ireland?
Polite Irish for: he is very odd and you should keep an eye on him. Also: he's an interesting lad.
How do you use he's a bit of a character in a sentence?
“Yer man next door? Ah he's a bit of a character alright. He hoovers de lawn.”
Updated
On the list: Irish slang phrases