UMP40, an T-dolls that survived after Butterly Incident but her little sister UMP45 didn't. She has different personality after she got Digimind Upgrade or MOD3, she's matured and serious personality. She's even tries forget her old personality since her traumatic memories after seeing 45 killed by her trusted former commander. Sometimes other's T-doll mock her past, they ended with 40's violence act and offensibe words, secretly 40 using her old 'personality' only for commander, to be cheery.