>>23421It's been a while since I last played the Mass effect games but in terms of personality, some traits that come to mind include:
Intelligent [perhaps not always the wisest or most mature but knowledgeable]
Curious [particularly about machines]
Loyal [To Shepard and her fleet/species/family]
Snarky [Particularly around Garrus]
Selfless [Both a good and bad trait since she often places blame on herself]
Hates Geth [For obvious reasons, at least, until the last game]
Germaphobe [because Quarian biology]
In terms of scenario ideas:
1. Because of the Quarrian Migrant Fleet's strict rationing, Tali became enamored with the abundance of food available in Citadel Space and went a bit overboard, gorging herself into obesity and becoming side tracked from her pilgrimage.
2. Tali attempts to alleviate the supply problems with the Migrant Fleet by becoming the test subject for a hyper calorie-dense processed foodstuff but became addicted to it/experienced unforeseen side effect
3. In an attempt to help her people survive outside of the hermetically controlled environments of their ships, Tali undergoes a treatment to strengthen her natural constitution and immune system. Whether this was the intended effect or another unforeseen side effect is up to you.
4. After the first Normandy was destroyed and Shepard was presumed dead, Tali fell into a deep depression and essentially spent the time skip between Mass Effect 1 and Mass Effect 2 comfort eating. When Shepard comes calling, she's too out of shape to answer.
5. Tali gets captured by the Reapers/Collectors and experimented on in an attempt to maximize the amount of biomass a since sentient being can produce to later be converted into Husks. She managed to get rescued but not before being altered by the Reapers/Collectors.
