Abstract: The present invention generally relates to modified miniature proteins, including modified avian pancreatic polypeptides (aPP) and modified pancreatic peptide YYs (PYY). One aspect of the invention is generally directed to various aPPs that have been modified such that they do not substantially form multimers in solution, for example through the addition of a proline switch. Another aspect of the invention is generally directed to modified PYYs, such as YY3. Yet another aspect of the invention is generally directed to composites of modified miniature proteins formed from portions of different miniature proteins such as aPP and/or PYY, optionally with a proline switch. Still other aspects of the invention are generally directed to methods of making such proteins, methods of using such proteins, kits involving such proteins, and the like.