Hi @Kelvin
You need to first be sure that is absolutely necessary for you to have to leave Germany and go through the visa process. There are exceptions to this rule, in particular if a small child is involved. Depending on the age of your child, you can inform the Ausländerbehörde that it is unreasonable (in German the specific term for this is ‘unzumutbar’) to expect you to leave for the visa procedure. This is because it would mean a lengthy separation from your child. But here the age of the child and visa processing times in your home country play a role.
Here you can read more about this rule:
https://***-advogarant-de.translate.goog/rechtsanwalt/gebiete/rechtsanwalt-fuer-internationales-recht/nachholung-visumsverfahren?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
We cannot say what influence a criminal conviction will have on a visa application. It is important to distinguish whether it is a full criminal conviction (in German ‘Straftat’) or a minor offence ‘Ordnungswidrigkeit’, which usually results in a small fine. As part of the visa process, the embassy considers whether there are specific grounds for denying someone a visa. A person can be denied for serious crimes which result in imprisonment of at least six months. You can read the range of such offences in the relevant paragraph of the immigration law here:
https://***-gesetze--im--internet-de.translate.goog/aufenthg_2004/__54.html?_x_tr_sl=de&_x_tr_tl=en&_x_tr_hl=en&_x_tr_pto=wapp
If it a minor offence, then it does not play a role.
Best,
Éanna