Despite the downpour, he stood there stoically with a minikin brolly, offering more irony than protection.

Minikin - (obsolete) A small or insignificant person, thing or amount. Brolly - (UK, Ireland, Commonwealth, informal) Alternative form of brelly.

Brelly - (UK, informal) Synonym of umbrella.

https://en.wiktionary.org/wiki/minikin https://en.wiktionary.org/wiki/brelly#English https://en.wiktionary.org/wiki/brolly