As character names:

U+FF9F HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK character (ﾟ)

As raw characters:

ﾟ

As a string of HTML entities:

ﾟ

Decoder output:

Byte number 1 is decimal 240, hex 0xF0, octal \360, binary 11110000
This is the first byte of a 4 byte sequence.

Byte number 2 is decimal 143, hex 0x8F, octal \217, binary 10001111
This is continuation byte 1, expecting 2 more.

Byte number 3 is decimal 190, hex 0xBE, octal \276, binary 10111110
This is continuation byte 2, expecting 1 more.

Byte number 4 is decimal 159, hex 0x9F, octal \237, binary 10011111
This is continuation byte 3, expecting 0 more.

U+FF9F	HALFWIDTH KATAKANA SEMI-VOICED SOUND MARK
	# <narrow> 309A