Someone above you in a managerial role, or a position you reported to is generally sufficient.
Whether it be the HOTAC who may not care if you leave as they’re not tied to the company the way the owners or CPs tend to be (This was my case where my hotac in GA clashed with the CP and owners and loved referencing pilots to move on).
An ICUS pilot, check and trainers or senior base pilots are sufficient.
Or if it’s your salty CP you fear but you get along with the business owners then they are fine to reference you too. Doesn’t have to be the CP.
FWIW Q group from memory wants two references; one in the last 2.5 years and one in the last 5.
I didn’t use anybody from the company I was at when I applied. I used a senior pilot from 4.5 years prior who mentored me and a CP from two years prior I was on good terms with. The airlines tend to know your current GA employer will be salty as they’re experiencing a high turn over.