He seems to be the leader of the cult/following which involves his "friends" worshipping Malcolm.
Shrignold is the only teacher not to be based off an inanimate object.
The caterpillar Bird Guy killed at the end resembled Shrignold (possibly a dark, satirical look on abortion).
Because Yellow Guy is the embodiment of the young demographic that the show is parodying, he calls Shrignold "a little baby pigeon".
Shrignold seems to bear some similarities with the cult leader Sun Myung Moon with his views that God requires placation (like how the other cultists must feed Malcolm rocks) and how he arranges marriages.