The rarely seen Father Ronaldo is one of Maxwell's advisors, and he directed Father Alexander Anderson to Badrick to fight the rogue vampire there. He also appeared as Maxwell's attaché in his journey to London to meet with Integra Hellsing; he was unable to stop the confrontation between Paladin Anderson and Alucard, and was visibly relaxed when Integra and Maxwell left peacefully.

In the anime, he appears in the same capacity, but briefly holds the hilt of his sword before Maxwell calls Anderson against Alucard, indicating he was willing to engage Hellsing operatives to protect Maxwell.