This is covered in the ring help that pops up when you start a new ring (the ring help can also be accessed with ?fdg at any time):
Not all monsters are suitable ring-bearers. Bearer candidates include all humans (p), humanoids (h), townspeople (t), angels (A) and yeeks (y), most vampires (V) and liches (L), and a few other thematically suitable monsters such as the Nazgul. The Charm Ring-Bearer power only works on these monsters; and even if you still acquire other monsters as pets, you cannot ride them or make them pick you up.
A 18/193 STR berserker shouldn't need very many attempts.

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