DemiBirdramon

"..where Mavi is free-spirited and laid back, Fia is fierce, dutiful and disciplined. There's a desire to become stronger in her heart, a need to protect her tamer and little sibling" 

Say hi to Fiamma! Maybe not the fully final design, but close to what I wanted for this digimon

She definitely started out as a regular Biyomon, but after reaching the strength to stay a Birdramon for a long time/as default state, 

she changed into a DemiBirdramon when devolving - the rest of the evolutions will be more Dramon focused too.