She won't show up on thermals that's for sure. Although do they aim to go after the dark spot in the heat scan?
Unless she can regulate the freeze just low enough to blend into the ambient temperature, she won't. If there's a hole, the Predator can aim for it manually. In all fairness, Wriggle and Wakasagihime have the best chances of a sneak attack, although Nazrin could swarm him with mice and drown out any other signatures.
Wriggle wouldn't need to ambush. She could do the same thing as Nazrin, only a LOT more effectively.
Not really, bugs don't show up on thermal either. But yes, sneaky drones would work too, and quite a lot better than regular ones. The sneak attack meant "Danmaku from an unseen source", though.
Unless she can regulate the freeze just low enough to blend into the ambient temperature, she won't. If there's a hole, the Predator can aim for it manually. In all fairness, Wriggle and Wakasagihime have the best chances of a sneak attack, although Nazrin could swarm him with mice and drown out any other signatures.
Too bad for Wakasagihime that Gensokyo is a landlocked region and there aren't that much bodies of water inside.