Final answer:
Charisma and likability, personal relationships and alliances, and negotiation skills and tact represent more informal powers derived from personal ability to persuade members of their party.
Step-by-step explanation:
The more informal powers derived from personal ability to persuade members of their party are charisma and likability, personal relationships and alliances, and negotiation skills and tact. These are all examples of informal powers that enable a leader to influence and gather support from party members. Charisma and likability help a leader to attract followers and gain their trust, personal relationships and alliances allow a leader to build connections and form coalitions within their party, and negotiation skills and tact enable a leader to persuade and convince others to support their ideas and decisions.