Though they may have never interacted in the canon timeline despite them being from different games, they interacted in the Ultimate Talent Development Plan, which is Danganronpa V3: Killing Harmony's bonus mode. Despite though not being canon.
In the Ultimate Talent Development Plan, Rantaro brought animal pictures for Peko as she wanted it after going on his trip, Peko thanked Rantaro for it. Mukuro in her disguise, comes across, both Rantaro and Peko. Mukuro didn't know that the both of them were meal buddies, Peko then tells her not to worry about it. The three of them then spent some time looking at animal pictures.
In the Ultimate Talent Development Plan again, the event duplicates when playing as Junko, although it will be a little bit different, Junko then joined in their conversation, Junko says that she didn't know that the two were such a pair, though Peko tells that Rantaro was just showing her pictures. As said again, the three of them then spent some time looking at animal pictures.
Despite Ranpeko being a rare pair, Ranpeko is easily overshadowed by Kuzupeko, which is Peko's most popular ship and Amasai, which is Rantaro's most popular ship. Though Ranpeko gained some popularity from their event in Ultimate Talent Development Plan.
As from their event, most Ranpeko shippers found it cute and wholesome from their event as Peko has a soft spot when it comes to animals, Rantaro can always give her animal pictures from his trips. Most fan arts indicates a wholesome and fluffy fanarts between the two. Though there are a few fan arts with the two of them. On Archive of Our Own, the ship currently has about 2 fanfictions.