So as probably gathered which adds you get depends on which order you go. With the last one being the different colored significantly more powerful version. Each version seems to increase hp a bit as well. Orders/info
Beetle: All my ranged auto ws and melee hits were doing 1/3 to 1/2 normal dmg. Skillchain dmg seemed normal likely huge pdt. The ws dmg didn't seem to change much with different ones but skillchain seemed lower on earlier ones
1st - Agitated
2nd - Incensed
3rd - Enraged - Only special thing I could find was it seemed to unlock rhino wrecker. That said would still recommend not doing beetle last just because giving the mob that has a ton of pdt more hp just results in the slowest kills. Recommend first maybe 2nd
Wamoura: Took more dmg from physical. Autos were doing 1.5-2 times normal dmg (only done 1 run of each but seems to vary based on which stage you get) skillchain dmg seems normal though heavily resists fire
1st - Sturdy
2nd - Obstinate
3rd - Immovable - Only special thing I could find was it seemed to unlock Firebreak. The extra physical dmg seemed to go down a little bit but still did more than normal. Basically a pushover Recommend last
Chapuli: Took slightly higher than normal physical dmg and a good 50% higher than normal skillchain dmg. Most likely weak to magic. Somewhat evasive even on stage 2.
1st - Thinking
2nd - Pondering
3rd - Philosophical - Didn't see if it unlocked move but it likely did. Becomes extremely evasive (like my autos were uncapped with ws at 1450 racc). Recommend 2nd or 1st.