Killswitch, OB (orange blotch) is not a specific species or variety of fish; it is a naturally occurring color morph found in a number of mbuna species, esp. in the genus Maylandia
and both species of Labeotropheus
. It has become a common way of denoting hybrid OB peacocks in conversation, which is misleading as this disregards the naturally occurring OB pattern in mbuna species and implies any OB is a hybrid fish.
The fish in the pic could be an OB zebra. The pics are kinda blurry so the head shape doesn't look too off, IMO