Junkrat

He flips out when his S/O tells him

Like, genuinely flips down

Then just kind of passes out on the spot

Once he wakes up, he's giddy but worried as hell

Will be he able to be a good father?? He doesn't know???

He reads up on all the baby info

Helps his S/O to the best of his ability

Gives them massages, gets them the foods they're craving, holds their hair during morning sickness, helps them shower and get dressed if they need it

Surprisingly gentle

His S/O is the most fragile thing in the universe now

Reads to the baby

Sings (badly) to the baby

Talks to the baby

Rubs his S/O's belly

Kisses their belly

Starts keeping their living quarters and himself cleaner so the baby will grow up in a more or less healthy environment

Buys (steals) and makes all sorts of knickknacks for when the baby is born

His S/O will have to stop him from making them a beginner bomb making set and the like

Builds all the furniture in the baby room

No, Jamie, the baby will not be having rockets on its crib

He makes himself a another robotic arm specifically for carrying the baby

It's smaller than his original bulky one and it's padded as to not hurt the baby

Tbh, he'll be a great dad