My opinions on Transformers Ships

Optimus x Ratchet (TFP)

It's a cute one. Not one of my OTPs, but it's a close second Ratchet ship to Wheeljack x Ratchet (My second OTP)

Ratchet's relationship with Optimus was really nice and happy.

And in Predacon's Rising, when Optimus was going to sacrifice himself, Ratchet was like "I didn't return to save a life only to lose the one I care about to most" and that felt really sad for me...losing the one you care most about can be very hard and sad.

And in the last episode of Season 2, Ratchet believed it would be the last he and Optimus would see each other.

Until Episode 4 of Season 3, when Ultra Magnus said that Optimus was alive, Ratchet said "Thank the AllSpark!" meaning he was so happy to see Optimus alive.

Not to mention in Robots In Disguise 2015, when Ratchet saw Optimus alive, he couldn't believe his eyes! Optimus Prime is alive! But considering RID 2015 is considered a "kids show", they didn't make them hug (Hugging isn't as bad as kissing RID show makers *facepalm*).

Overall, it's a great pairing :)