"Peter" is Thai regional colloquialism for "roach" in general. In Catstudio's Miku Plus comic (pool #2593), she's a recurring character that often causes havoc on the cast.
She (always a female, despite the male-sounding name) is resistant to household bugspray, can fly fairly fine, and is weak against cats. Especially to the residential cats Puni (Miku Plus) and Kuro (Miku Plus).
See also
- Gokicha (Character) (another cockroach Personification)