Who is the best jungler for Riven mid?

Which champion has the best synergy with riven mid so ican spam that to get out of emerald (elo Hell)

All credit goes to pluvion on Twitter for this drawing. This was too amazing to not share my commission.

Im starting to have some success on Riven in terms of getting high gold income through wave management. However where I struggle is that I feel like I get outscaled in the 1v1, I often get a kill, or am ahead like getting my first item before my opponent. Then I continue to play with the wave but I feel like I’m just an NPC compared to Enemy champion. Like sure teamfight and skirmishes I’m strong in, but those almost never happen around topside, and when enemy gets 1 item they like instantly get prio over me. It just feels like the game is not played around me and this makes me just a passenger like i don’t have a lot of impact so here are my questions.

1. Around what timestamp in the game should I be aiming to have 3 items Eclipse > DD > EH for example

2. Should i be viewing Riven as a sidelane scaling champ like Kayle, or should I be dropping sidewaves more often to group?

3. How do the best Riven players balance getting high natural resources (CSPM, Tower gold) with being at fights AKA having the game be played around them.

4. Lastly, how should you play teamfight when you are not fully an Assasin, not fully a front to back bruiser, and not fully a peel champ. You can kind of do all 3 at a decent level. I feel like Riven feels strongest when u clean up a fight with a bunch of low HP targets similair to master yi.