First let's preface this with they're not very good relative to the other options, but it doesn't make them 'bad' just temper expectations.

**Chara Soon** is going to be useful by default because of the 2x Chance Step and she's easily stronger than Elpeo Ple (even if you SP Break Elpeo). Starting MP isn't that helpful really since she has Mp Up and will still need to use it twice to reach Supercharged if she can't get at least 1 Mp through other means. If she can use a Support Attack and gets a hit from her starting position then that will give her enough Mp that she only needs to use Mp Up a singular time, so starting Mp does have use, but she's not strong enough to use as a PvP pilot so the Passive Damage boost when it's not her turn if you can't control her won't be a factor. Regardless Mp Up will allow you to access suit Abilities and certain weapons which is very helpful as there's a number of strong options with Tension requirements including SR ZZ Gundam  or SR Enhanced ZZ Gundam whichever you choose to SP break. Since she gains Attack when Support Attacking you could put her in the Quin Mantha as it gets the Series based Attack boost and can compete with to a degree with Attack Suits as long as your fighting ZZ Series opponents and Chara can get access to the Quin Mantha's Map which also uses her Awaken Stat to maximize Damage. The issue is that Movement isn't "amazing" so she's essentially working with 1 Skill consistently whereas High Speed will be situational and would be even less helpful if ZZ wasn't full of low Movement Speed suits. Merit of being SP Broken for free and 2x Chance Step she's going to be the 'best' Supporter from the ZZ Series.

**Quin Mantha** honestly is pretty bad. Only one single target Debuff and even if it is a Defense Debuff it limits the usefulness over multiple Support Attacks especially since Zeta Gundam is a 5 Range Defense Debuffer that is usable in the ZZ Series and IMO Zeta Gundam is the logical choice to SP Break from the Zeta Gundam Series for various reasons which means you have a relatively strong Defense Debuffer and one that would benefit from Chara Soon as well since it has a Tension based high Damage Weapon plus a Tension condition to gain Attack. Comparatively in the ZZ Series the Quin Mantha is stronger thanks to the Attack and Defense it gets against the ZZ Series, but that doesn't mean it's impressive and being redundant hurts it further. The Map is interesting, but having only one Ammo severely limits the actual usefulness of it. Whilst the Map can serve as a one time Special Debuff the real interesting part of it is that since you can pick two locations you can overlap the AoE to concentrate Damage since it will hit the same target twice if you so choose this makes it a high Damage Weapon even without Quin Mantha being an "attack" role. Outside of that Quin Mantha is pretty basic, but actually pretty versatile. I-Field Lv2 reducing Beam Ranged Damage by 40% and having a Shield Mechanism lets you use the suit as a Defense suit if you you're so inclined and SR Ple-Two has the right Affinity and decent Offensive Stats if you opted to SP Break her. SR Haman on the other hand brings Attack Boost as well as the Support Attack Count Increase. If you can get the Mp to use the Map attack through other means Haman's 744 Awaken is much higher than Chara Soon or Elpeo Ple, she gets the Damage boost from the Affinity, and can stack Attack Boost on top to use the Map Attack for much higher Damage than Chara Soon could whilst being a Support Pilot she's still able to get more out of the suit each subsequent turn even if she trades off 1 Support Attack. Trading off a Support Attack in a suit that is stronger than non-SP Broken Attack suits does hurt, but it's not as if you're losing those extra Attacks entirely they're just being moved to a different suit.

**Conclusion:**  
Chara Soon is a good pilot for suits with Tension based Weapons or Abilities, particularly useful for a suit like SSR Zeta Gundam as she'd be able to take advantage of her Increased Attack when Support Attacking in it so if the suit is SP Broken you Giant Beam Saber's respectable 5400 Weapon Power which uses Awaken + Zeta's 8,489 Base Attack not only hits decently hard the Special Attribute type makes it great for the ZZ Eternal Road as ZZ resists Physical whilst Qubeley and Quin Mantha resist Beams. She also works in the Support Quin Mantha, but in the ZZ Eternal Road at least you should be able to gain Tension with the Quin Mantha through other means than MP Up making SP Broken Haman Karn a better pilot to get the most out of the Quin Mantha. Chara would also work with popular ZZ SP Targets. The Quin Mantha is redundant to a strong Supporter that is a valid in the ZZ hurting the overall usefulness. The suit is uncharacteristically strong for a Support suit having 9,727 Attack Base when SP Broken which like the other Challenge Mode suits comes with the SP Materials. Able to take a counterattack as long as the Attribute of the Weapon is Beam and an interesting Map help the suit significantly, but since it only has one single target Debuff which isn't even a 30% Debuff it's going to be relegated to use against ZZ Series whereas Char's Zaku II and Gundam Astray Gold Frame Amatsu Mina having 2 Debuffs tend to be more useful in general so IMO it's the weakest Support suit earned through Challenge Mode thus far. Both the single target Funnels and the Map being Special help it punch through the ZZ Eternal Road though so it's a big help for anybody looking to clear the Eternal Road with Dev/Other only suits which if you have access to UR Haman she's an extremely strong pilot for it having very high potential to stack the Damage on the Map to clear one of the peskier units from the Eternal Road by overlaying the Damage and also avoid the Defend Command. Being that she has high Awaken and Neo Zeon Affinity she gets high natural Damage with the single target Funnels to make it easier to get the Tension required to use the map when needed.

  
Just to try something new to helps with Eternal Road my picks for which suit some of the potential standout pilots should use (Let me know if it helps and would you'd like to see it in future Challenge Mode threads):  
**UR Haman** \- SSR Support Quin Mantha  
**SR SP Broken Haman** \- SSR Support Quin Mantha  
**Chara Soon** \- SR ZZ Gundam/SR Enhanced ZZ Gundam/SSR SP Broken Zeta Gundam  
**Elpeo Ple** \- Geymalk  
**UR Judau Ashta** \- SSR Full Armor ZZ Gundam (His Affinity and starting MP alone will make him stronger than most other choices for Damage output , but HP Repair let's you use the bulk of Full Armor ZZ to take some hits whilst Save EN let's you counterattack more easily without causing an Energy crisis so he's quite strong there even if you don't use him to Support Defend since he's a 1x Support Defender anywhere you can get by with the other options as your Support Defender)  
**Rakan Dahkaran** \- SSR Defense Quin Mantha (may have terrible Awaken, but the Map is Ranged, Funnels are 5 Range so can just be used to Debuff Mobility when you outrange your opponent to not waste HP. Quin Mantha is generally better than the Zaku III Custom for the Eternal Road due to the I-Field since the opposing suits lack Absolute Hit.  
**SR SP Broken Ple-Two** \- SSR Zaku III Custom (Psycho Pressure on the Zaku III actually deals decent Damage in a pinch and Ple-Two's Awaken + Reaction can give you a reliable hit when you need a bit of extra Damage to take down an opposing suit whether you're using Support Attacks with it or picking off severely damaged suits from previous Attacks.)  
**SR SP Broken Judau Ashta** \- SR ZZ Gundam (Judau gets Mp Up when SP Broken)  
**SR SP Broken Elepeo Ple** \- SSR Geymalk (Elpeo Ple gets Sway and 794 Awaken when SP Broken)  
**SR Roux Louka** \- SSR Attack Hyaku Shiki (high Range + Boost Range for the Clay Bazooka)  
**R Elle Vianno** \- SSR Support Hyaku Shiki/SSR Zeta Gundam (Despite being a Rare Elle is still a Support Pilot and they're objectively more useful at lower Rarity as despite their Stats they still get that Support Attack to try to spread Debuffs to more targets or simply deal more Damage than their potentially 'stronger' peers can deal in a single hit since Supports get 2.

Chara Soon + Quin Mantha