Fricatives and Sonorants can be in a nucleus of a syllable. Can plosives also act as a syllable? If so, do any of your conlangs have this feature?
ANADEW: Nuxalk aka Bella Coola is a natural language famous for its long chains of plosives. However, calling the plosives syllables in this case raises another question: Is syllable a term that is suitable for the description of Nuxalk, or should one say that there are no well-defined syllables in Nuxalk (see this question on the linguistics stackexchange for more on this).
For use in conlangs, see also Are there human beatbox inspired conlangs? on this site, five years ago there was kind of a "no" answer to the second question.