Optimus
His for you: Sweetspark
Yours for him: Big Guy
Ratchet
His for you: Dear
Yours for him: Grumpy
Bumblebee
His for you: Honeybee
Yours for him: Sweetbee
Arcee
Her's for you: Kitten
Yours for her: Bae
Smokescreen
His for you: Cutie
Yours for him: Champ
Bulkhead
His for you: Teacup
Yours for him: Hero
Wheeljack
His for you: Sunshine
Yours for him: Loverbot/Loverboy