The amount of water, light, fertilizing, and drainage a plant needs to thrive are basic information in any competent article about a plant and its care. This should be part of the research in choosing plants for a habitat.
All the mention of horticulture reminds me of the (in)famous Dorothy Parker quote (which I won't repeat here).
Pretty much any tropical plant will need a lot of water. Here are three that would be good:
Sounds to me like you just answered your own question. Bromeliad is on my list for "fill-ins".
They're are some types without the spikey style leaves.thank you I was just wondering since they were spiky.
So, schleffera (umbrella tree) and Croton for sure will die if kept moist, they prefer to be kept dry with periodic soaks. They'll rot otherwise. Hibiscus probably wouldn't do too poorly, as some species grow near swamps, but I don't think most cages get enough light to keep one alive. I'd recommend plants like Maranta leuconeura, which loves having wet feet and super moist air, plus has an added bonus of large, flat leaves for water to collect on. If you mount them and keep the soil dry, many hoyas and epiphytic species do well in high humidity too.
