With, do with someone

Words indicating a person who does something with another person who is the subject of the sentence.

• What words indicate someone who goes somewhere with another person?
  with along
• What words indicate someone who does something with another person?
  with in conjunction with in partnership with in collaboration with side by side with shoulder to shoulder with
• What words indicate someone who does something bad with another person?
  in league with in collusion with in cahoots with hand in glove with
• What words refer to someone who does something with another person?
  partner companion fellow (student) sidekick