Como dizer seja lá quem for; seja lá como for; seja lá onde for; ... em inglês.
Além dos indefinidos whoever, however, wherever, whenever etc. tem vários outros modos de expressar a mesma idéia:
► no matter who (how, where, what etc.)...
► regardless of who (what, how, where etc.)...
► I (you, he, she etc.) don't (doesn't) care who (how, when etc.)
Ex: No matter who said that, I think he or she was wrong. Regardless of who said that, I think he or she was wrong. I don't care who said that, I think he or she was wrong.
Duas coisas precisam ser salientadas:
►► Evidentemente, todas essas frases poderiam ser iniciadas com um indefinido: Whoever (may have) said that... Wherever Walter is (may be) now.. Whatever you (may think)...
►►Das três formas apresentadas, a terceira é a mais informal e, portanto, a menos "polida" de todas.