The only ability that does any kind of buff of sort is Primeval Brew, And that’s their sort of my little FFXI Easter egg.
As far as it’s likliness to AST/MCH I mean it uses a gun that’s tied to a overheat gauge?
The buffs at the chemists disposal effect his healing brews; not party member buffs: I see where Royal Road mechanics could be it; where royal roading certain cards causes AOE effects / enhancements to cards etc. but that wasn’t entirely my entention to have it resemble that AST mechanic; a happy resemblance I guess