I think its all down to your character as to why or why not you would use it.
I'm doing an evil playthrough now with a power mad wizard who is becoming increasingly tempted by powers offered by the tadpole. It doesn't break my immersion at all because its in keeping with this particular character. We all know IRL that many people become tempted by and addicted to things they shouldn't.
By having the tadpole powers present there is obviously a storyline to follow there and I'm curious to see where it goes.
You make a fair point. All sorts of different characters exist, but...
It's a brain parasite, not a heroin addiction or a hunger for power. I'm not hung up on being seduced by the promise of power (that's cool); rather, I think it's really, really hard to get over the fact that it's a brain parasite. There's an element of being a victim of body horror and psychological horror that doesn't necessarily gel with my concept of a self-serving, power-hungry individual. I think a lot of power-hungry, selfish characters also have
a sense of self-preservation, if not a particularly strong one.
