A character from [i][[Getsuyoubi no Tawawa]][/i]. [[kouhai-chan (tawawa)|Kouhai-chan]]'s senior coworker, who is also her unofficial self-appointed guardian from those who seek to exploit her when she's off-guard, especially when she's drunk.

His protectiveness becomes a factor in him bonding with [[kouhai-chan (tawawa)|Kouhai-chan]]'s college friend [[rikei-chan (tawawa)|Rikei-chan]] (post #3622784), as she "used to do the same thing":/posts/3256706 back in the day.

His name is written 先パイ, which is a pun on 先輩 ("senior, upperclassman") by way of how the second kanji is pronounced identically to the second half of オッパイ ([i]oppai[/i], meaning "breasts").
senpai (tawawa)