3) Venli did bond two sprens. A void spren that gave her new form and timbre who makes her a radiant. As to whether other humans can do it or not, Brandon has mentioned it as theoretically possible though i dont think we will see this(personal opinion). Other listeners could have multiple bond.
4)Azures sword is not a shardblade, though it is hinted it is desinged after the shard blade. Nalthis and Roshar have magic systems that can substitute each other easily.
9) There are two people.
10) Nightblood when unsheated will drain any type of investiture including souls. Yes the process is similar. Every object has a spren ig. (not sure)But nightblood isnt 'a' spren.
12) I believe its a restriction on bondsmith order. Their powers arent meant for destruction, for unity hence they dont get a blade.
14) Well, Vedens i believe have red hair and is paler. not sure on llanguage.
15) Yes, the ones the ones whose oaths were broken. So all the shard blades before the new radiants.
16)Timbre .
17) Not sure but i believe he is saying szeth that all must act according to what they believe their oaths mean them to, and hopes they follow him.
18) Deatroyed as maybe captured in Urithiru and no longer a threath.
19) Roshar was once inhibated with listeners and spren lived with them. Humans came and began the desolation. Howerver for some reason they changed sides and joined humans leading to formation of radiant orders.
20) He was nurtured by odium to be his champion. And i believe being a resident of roshar or being a radiant makes u a child of honor(kaladin is reffered as son of tanavast).
22) he cant hear his wifes name when spoken by someone else.
24) Ig its a void spren.
25) That he wont kill her.
26) The thrill was the unmade there. Thunderclast arent unmade. And the araman bonded unmade
27) Most probably. yes
28) They saw passion in him and ig it is stated somewhere they are afraid to be near jezeiren.
30) yes
31) kaladin had collected it from szeth at the end of wor. Taravagian stole it from bridge 4 and maybe gave leshwi after odiums visit
33) if he touched directly he will hear the screams of the dead spren.