When you get gifted a sub, you can't subscribe by yourself that month, so you lose the chance to get the Founder Badge. So instead, the badge should apply to all types of subscribing.

For example you find a new streamer, you want to sub to it but someone gifts you a sub before having the chance to do it. Later, they get over 10 subscribers so you lose the chance to have the founder badge (even though you were one of the first 10).

If you gift 100 subs and they run out, your badge disappears forever unless you gift a sub every month. But if you gift 1 bit, in 5 years you will still have that (ugly) bit badge. That sounds unfair to me. Make the sub gift badges permanent, or make it so that it will stay 1 month for every sub gifted (so for 10 gifted subs get the 10 gift subs badge and keep it for 10 months).

Instead of the default icon for a VIP badge, allow me to upload an image for my users' VIP badge to show. For instance I give VIP badges to people who have won tournaments that I've broadcast on my channel. I'd like to make the VIP badge icon be a trophy.

I wanted to make a suggestion about the menu on the left side of the screen with all the people I follow. If you added my current subscription badge next to the channel name, it would catch peoples attention more and make them more involved in the channels they subscribe to (or got gifted subs). There have been many times that I even forgot that I had a subscription to a certain channel.

A badge that shows who are the most active chatters of all time in your stream will be awesome. As chatters are so important to streamers, streamers really appreciate chatters. So there should be a badge that shows the top 10 most active chatters of all time. As this will highlight the people that are always engaging with the streamer and putting their time into your streams.

Let's say that you have been sub to a channel for 5 years and cheered total of 100000 bits.

It would be great to have the ability to choose what badges to use in front of your name from all badges you have unlocked on the channel, for example if you like 2 year sub badge more than 5 year badge you could just change it and same with bits you could use 75000 badge instead of 100000 badge.

I think the first 1st Sub badge is a really good idea, but i feel like there should also be a 1st follower badge to show the people that have been there since u have have started, so maybe a badge for the 10 or 20 followers of each channel to show that they have been supporting from the very beginning as maybe they are not to subscriber to show support but still followed u at the very start.

Having different sub badges for people of different sub lengths is really cool but sometimes you really like your sub badge but your enter the next bracket so you have to go with a higher up one that you think is less cool.
I think it would be better if you had the option to use any of the sub badges up to what you have reached

Account age badge,
Something to show the age of an individuals account. Maybe a badge for 5 years after the account was created, or one for 10 years after an account was created. There are already badges for sub age, why not one to show how long the person has been on twitch overall.

make it where streamers have an option to give badges to there community members which could say resemble their graphic designer so they can make more people stand out instead of jut vips

Create a chat badge that varies based on how many channel subscriptions a viewer has