As long as it meets the legal requirements, you can be a wife or a guarantor.
Relevant laws stipulate the Criminal Procedure Law of People's Republic of China (PRC).
Article 67 A guarantor must meet the following conditions:
(1) is irrelevant to this case;
(2) Having the ability to perform the guarantee obligations;
(three) enjoy political rights and personal freedom is not restricted;
(4) Having a fixed residence and income.
Article 68 A guarantor shall perform the following obligations:
(1) To supervise the warrantee to abide by the provisions of Article 69 of this Law.
(2) If it is discovered that the warrantee may or has violated the provisions of Article 69 of this Law, it shall promptly report to the executing organ.
If a guarantor violates the provisions of Article 69 of this Law and fails to perform his guarantee obligations, he shall be fined, and if the case constitutes a crime, he shall be investigated for criminal responsibility according to law.