Tahu seems to have more mind hax abilities than Blade, although Blade can resist to them and has a greater amounts of offensive abilities. Don't known much about Bionicle outside that one movie, so just going to wait for the "expert".
So, are they biological? When I was a kid always though they were robots. Anyway, that's means it can be affected by Fragance and Bionic Compressor secundary effects (although I think it can adapt to the last one).
Bionicles are bio mechanical, not all of them, but the toa are. They do breathe, as they need a specific mask to let them breathe underwater. As for how the Adaptive Armor works, it gave all 6 toa the ability to fly when they were transported to a place where flight would be ideal, but I don't remember what else it did.
Given that Tahu is mostly mechanical, magnetism is a huge issue for him. He'll be immune to Lilith Temptation, as he's a biomechanical being. It won't work on him if it doesn't work on cyborgs. I'm not sure if he could adapt to Fragrance and Bionic Compressor, but he'd be able to deal with them at least to some extent, and retaliate with his own plethora of abilities.