For those who might be wondering, the Mix Max fusion, unlike most fusions, does not fuse bodies, only drains some person’s energy, personality, feelings, soul and aura and merges it with someone else, giving that person a new appearance and characteristics based on the previous person, it’s like 2 lifes in one body.
In this case, Diamond Tiara is the host one.
Here’s the origin
Meet Twinkle Rose. She’s a secondary antagonist who’s a bully. She also has anger problems.
Wow, first person who figured that out :D