With package options standard, ntheorem will define "a standard set of theorems", see texdoc ntheorem, sec. 2.3.6. thmtools could have this feature too, as requested (softly) by @dbitouze in texstudio-org/texstudio#2875.

To be honest I'm not a big fan of this sort of predefined things. Users always want to partially overwrite the "default" settings. Support for inheritable theorem styles (#15) has higher precedence than current feature request.

Also note that a modern set of standard theorem should be integrated with localization and
internationalization, e.g., babel and/or translations.