[Rendar]

Ruler summons can be Charmed > Pearl converted.

For the sheer amount of momentum that is invested into getting a Rook or Queen onto the field.

The fact that they can be converted has to be a bug.

[AkaInuHime]

Druid summons can likewise be converted. In both cases, they oddly remain under the control of the original player, though they do count as the converting player's side as far as targeting and damage + other effects. That might be worth fixing even if summon conversion is completely unintended, in the case of converting an EM-controlled party's unit.