7. ‘If there's anything more important than my ego around, I want it caught and shot now.’
It's a bit obvious but this quote makes me think Starscream.

8. ‘Simple. I got very bored and depressed, so I went and plugged myself in to its external computer feed. I talked to the computer at great length and explained my view of the Universe to it," said ______.
"And what happened?" pressed _____.
"It committed suicide," said _______’

And Megatron decreed that Dead End was never allowed to use the computer again.

21.
?: Your entire crew has an ulterior motive. ____ wants to use your planet to spread his faith. ____ is in lust with your ship. ___ is always plotting something, and Primus only knows what the purple one is up to. Does it really surprise you to find out that I'm no different?

Well, the first blank is Sunstorm, the third one is Starscream and the purple one is Skywarp. If you keep with the seeker theme I guess that leaves Thundercracker or one of the Coneheads for the second blank.