the bosses could be Picoro, Vegeta, android 17,18/cell, Majin bu (thinking that his presence is already in the zombies and slimes), Even a G.Freeza pors moonlord, an other version (1.3/1.4/1.5) Broly, Granola, Moro, and the final boss Beerus, or Giren?
if a boss is placed between the terraria bosses they have spaces to add the transmissions, skills and powers. If Picoro is placed in the forest before slime, Raditz in the desert before the eye, Vegeta in crimson/corruption, Frieza / freezer ship in the snow, the androids in the jungle, Majin bu in the forest / sacred, it would be good to occupy all biomes, Place bosses and that each one unlocks the transformation of their saga, the skills are raised by use, Example, energy wave when killing enemies/using the attack, you can learn kame hame ha.
They could add sensei Karin, who gives you a sensu every 2 days of the game, and they accumulate, and an object that increases your "gravity", you move slower, you take more damage, but your attacks and masteries go up faster,, kaio Ken's mastery is in proportion to use, (I don't know how you could add attacks without creating them only that you spend a menu, where you choose what attacks to do and with a button you change the attack of those you select), Can I say all my ideas and take the least crazy and possible?