As character names:

U+30BB KATAKANA LETTER SE character (セ)

As raw characters:

セ

As a string of HTML entities:

セ

Decoder output:

Byte number 1 is decimal 227, hex 0xE3, octal \343, binary 11100011
This is the first byte of a 3 byte sequence.

Byte number 2 is decimal 130, hex 0x82, octal \202, binary 10000010
This is continuation byte 1, expecting 1 more.

Byte number 3 is decimal 187, hex 0xBB, octal \273, binary 10111011
This is continuation byte 2, expecting 0 more.

U+30BB	KATAKANA LETTER SE