The best replacement for co signer is guarantor.

The best alternatives to co signer are rated as following:
★★★★★  guarantor
★★★★★  co borrower
★★★  co owner
★★★  co applicant
★★★  co buyer
★  co maker
★  joint applicant
★  co signor
  authorized user
  signer
  borrower
  cosigner

Your alternative for co signer is not listed? Suggest!
Speaking about co signer, one probably shouldn't forget about bad credit.

Other search terms related to co signer and their ratings are:
★★★★★ bad credit
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Google Trends

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co signer
guarantor
co borrower