createUserRequestV2.java

public class CreateUserRequest extends ClientNetworkRequest<User, Object> {
    // ...
    
    @Override
    public NetworkCallResponse<Object> onMakeRequest() throws IOException {
        EoLog.d(TAG, "Register a user called");

        String bearerString = ClientAuthManager.get().createBearerString();
        retrofit.Response<User> userResponse = EoApp.getAppContext()
                .getClientRequestManager()
                .getAuthApiService()
                .createUser(bearerString, mNewUser).execute();

        if (!userResponse.isSuccess()) {
           return NetworkCallResponse.get(userResponse);
        }

        // fetch the user's token
        boolean wasSuccess = ClientAuthManager.get().fetchUserToken(mNewUser);
        if (!wasSuccess) {
            return NetworkCallResponse.get(retrofit.Response.error(500, null));
        }

        return NetworkCallResponse.get(userResponse);
    }

Could you instead of using object use something like

ClientNetworkRequest<User, LisaSuperResponse>

And that LisaSuperResponse enforce a contact similar to what you were doing here: https://gist.github.com/niftynei/0dca2b1a0151788f4ecc